science Archives

January 14, 2023January 12, 2023

Emotional Tears Are Different from Other Tears

In 1662 Danish scientist Niels Stensen discovered that the lacrimal gland in the corner of each eye is the source of our tears. Human eyes produce three different types of tears, each with different purposes. Basal tears clean and lubricate the eyes. Responding to environmental stresses produces reflex tears. For example, we experience this kind of tears when we cut an onion. The third type is more mysterious. Emotional tears are different from other tears.

One difference is that we have some control over emotional tears. Secondly, they contain hormones and proteins not found in other tears. The proteins cause them to stick to our faces. Thirdly, researchers suggest that they are useful in confirming to others that we are truly happy or very sad. For example, watching a “tearjerker” movie causes us to produce emotional tears.

Emotional tears are different from other tears since only humans release emotional tears in moments of sorrow or joy. They are a way of communicating and sharing our emotions. The limbic system in the brain, which is associated with emotional arousal, triggers the brain’s message station (pons) to signal the lacrimal system to produce tears. No other animal produces emotional tears.

Researchers believe that emotional tears are a social cue to other humans to indicate that we need help. Babies don’t have fully developed lacrimal glands, so they can’t produce visible tears. Instead, they audibly cry when they need attention. As humans mature, emotional tears indicate a broad range of needs and feelings, including compassion, empathy, and sentimental or moral feelings.

People who shed emotional tears and receive support from others feel better. Holding back the tears or not receiving social and moral support leaves a person feeling less satisfied. Emotional tears are different from other tears because they can bring us together for spiritual and emotional healing. As humans, we have unique needs because of our relationship with each other and with God. That is one of the many factors showing that God created us in His image.

Reference: American Academy of Ophthalmology website

January 13, 2023January 12, 2023

Mangroves Are Essential for Many Reasons

We have mentioned before the value of mangroves and barrier islands for protecting areas prone to hurricanes. Mangroves are essential for many reasons, including solving today’s freshwater and climate change issues.

Mangroves grow in brackish waters that are a mixture of saltwater and fresh. For that reason, they grow in delta areas where rivers enter the sea or in coastal areas with massive amounts of rain. Mangroves can filter out 90% of the salt in seawater that enters their roots, and the mangrove root systems provide a place where marine organisms lay eggs and raise their young. Recent research has shown that mangrove forests store up to five times more carbon than any other land-based forests, storing 87% of that carbon in the soil beneath their roots.

Mangroves are essential for many reasons. They stop shore erosion, sequester carbon, provide a barrier to storm surges, and make a place for marine organisms to lay eggs and raise their young. They also offer a home in coastal areas for bees to build their hives and birds to build their nests. As a result, the honey industry gets much of its wild honey from mangrove forests. In addition, bird watchers have identified many bird species that depend on mangroves for secure nesting areas.

God gave us all kinds of plants to provide for our needs. From the desert cactus to the evergreens in cold weather areas to the seaweed in the oceans to the land trees we use for wood, plants are essential creations of God. Unfortunately, research shows that humans have eradicated 50% of the mangroves in the last 50 years, and we will pay a heavy price for the loss. We must learn to use these incredible resources wisely.

Reference: “Family Trees” in World Wildlife magazine winter 2022

January 12, 2023January 11, 2023

Water Shortages Worldwide

Potable water shortages are becoming more of a problem in various places on Earth. The water problem in the western United States has received massive attention. On our “Canyonlands” trips, we always spent a day on Lake Powell, but the water level in that lake has dropped so much that the tour boats we used can no longer operate. The Rio Grande separating the United States and Mexico was once a barrier to crossing the border, but now it is so low that people can walk across it just about anywhere.

In many African areas, potable water shortages affect both humans and animals. For example, northern Africa’s Sahara Desert is roughly the size of the United States and is home to many animals and people. In other areas, a lack of wells prevents access to the water underground. So is there a weakness in God’s creation that causes water shortages resulting in thirst and pain for millions of people? The answer is definitely not.

God has provided water stored underground and in the mountain snow, but humans refuse to manage the use of these stored reserves carefully. The desert plants God created, such as the saguaro cactus in the American southwest, prepare to survive the dry season by storing large amounts of water when the rains come. We need to apply that kind of wisdom to avoid water shortages.

Underground rivers contain massive amounts of water in various parts of the world. For example, before the last ice age, the United States had a river we call the Teays, which was much larger than the current Mississippi River. It started in North Carolina, Virginia, West Virginia, and Ohio winding through northern Indiana and Illinois, eventually joining the Mississippi drainage. It was miles across. When the glaciers came through the area, they diverted rivers and filled the riverbeds with sand and gravel. As a result, the Teays River became buried, and the porous deposits today store massive amounts of water.

The largest freshwater lake on Earth is Russia’s Lake Baikal, which holds more than 20% of Earth’s fresh surface water, equal to all the U.S. Great Lakes combined. Lake Baikal is 400 miles long with 1300 miles of shoreline, an average depth of 2442 feet, and a maximum of 5387 feet.

The bottom line is that, on a global scale, we have no water shortage. Our “blue planet” appears blue from space because of the abundance of water. Unfortunately, like most environmental problems, we have failed to use what God has given us intelligently. We have the technology to provide potable water to everyone on Earth, but greed, selfishness, politics, and poor management combine to cause water shortages. Water is a creation of God that we need to manage wisely and distribute unselfishly.

References: “Smarter Ways With Water” by Erica Gies in Scientific American for January 2023, pp 12-14, or scientificamerican.com and Geofacts # 10 from the Ohio Department of Natural Resources.

January 11, 2023January 10, 2023

The Pool of Siloam Affirms Scripture

The Israel Antiquities Authority, the Israel National Parks Authority, and the City of David Foundation celebrated the new year by announcing that in 2023, the Pool of Siloam will be open to the public for the first time in 2,000 years. The Pool of Siloam is where Jesus healed the blind man in John 9:1-7 using the pool to test the man’s faith and demonstrate Christ’s power to restore his sight. Skeptics have challenged the biblical account on several levels, but the Pool of Siloam affirms scripture.

The archeological excavation of the pool and its location in the southern portion of the City of David verifies the accuracy of the Biblical account. It was built as part of Jerusalem’s water system in the 8th century B.C. This construction is related to the work of King Hezekiah, described in 2 Kings 20:20. Archeological work and further excavation of the site will continue.

The Pool of Siloam affirms scripture and is now part of the Jerusalem Walls National Park, where it will be open to the public. This is another verification of the biblical record and adds more support to those of us who believe in the accuracy of the Bible as the Word of God.

Reference: Fox News

January 10, 2023January 9, 2023

Polar Bear Paws on Ice

If you have watched Arctic nature documentaries, you may have noticed that polar bears pursuing their prey can travel at impressive speeds and make rapid turns on snow and ice. A recent study of polar bear paws comparing them to brown bears, American black bears, and sun bears reveals how they can stop quickly on the ice.

Polar bears have more foot fur and smaller paw pads than other bears. The paw pads have microscopic bumps called papillae which are as much as 1.5 times longer than those of other bears. Friction experiments show that the taller papillae increase the surface area in contact with the ground giving more traction on slippery surfaces. The smaller size also reduces heat loss through the paws. When we were in Alaska, I learned that native Americans living there for generations could tell the color of the bear by looking at its paw prints in the snow or mud.

The polar bear is not just a brown bear with a white coat. There are design features in polar bears that equip them to live in an ice and snow environment. The design of polar bear paws is only one of the features allowing them to survive in an environment where no other bear could. Sun bears don’t have papillae at all because they would be useless in the bears’ tropical habitat.

The more we study the design of animals, the more examples we see of specialized equipment enabling life to survive everywhere on Earth. These examples remind us that “we can know there is a God through the things He has made” (Romans 1:20).

Rerence: American Scientist magazine for January/February 2023 page 15, or americanscientist.org

January 9, 2023January 8, 2023

Global Biomass and Human Responsibility

You may be surprised to know that the total biomass of bacteria in the ground is 1000 times more than the mass of humans. Mass is the total number of molecules present, and we usually measure it by weight, which is the pull of gravity on the molecules. For example, the mass of living things in the ocean equals 100 times the mass of all humans on planet Earth. In other words, if you totaled the quantity of matter in whales, fish, corals, clams, etc., you would have 100 times more molecules than in all living humans. If you counted the number of individual life forms in the oceans, the ratio would be even greater than 100-to-one, but that is quantity, and we are talking about global biomass.

Not only is the mass of underground bacteria greater than that of humans, but even worms have three times our mass. Even more surprising, the mass of viruses on Earth exceeds human mass by more than three times, and the global biomass of all bacteria is more than 1100 times that of all humans. There are some important messages in these numbers. One is that we must understand that we can’t eliminate viruses or bacteria in the world. Furthermore, we wouldn’t want to. Bacteria and viruses are essential in sustaining all other forms of life.

Another thing we need to consider is that humans keep (as livestock, poultry, and pets) a third of all mammal biomass on the planet and two-thirds of all bird mass. In Genesis 1:28, God gave humans the responsibility of managing all living things. We are now beginning to understand the importance of the conservation and management of life on our planet.

The global biomass of plants is another area where we have had a poor understanding. The mass of all plants is 7500 times greater than human mass, and like bacteria and viruses, plants are essential to life on our planet. Human destruction of forests worldwide and the replacement of vegetation with concrete are major factors in pollution and climate change.

The Genesis account says, “I give you every seed-bearing plant on the face of the whole earth, and every tree that has fruit with seed in it. They will be yours for food. And to all the beasts of the earth and all the birds of the air and all the creatures that move on the ground – everything that has the breath of life in it – I give every green plant for food” (Genesis 1:29-30). Earth’s design is no accident. The role of plants, bacteria, worms, viruses, and all life is a product of an infinitely intelligent and understanding mind.

The dictionary definition of “science” is “knowledge,” and it can never conflict with the mind that created all we see and are. When God challenges us to consider the wisdom in the creation, the human response is like Job’s, “Surely I spoke of things I did not understand, things too wonderful for me to know” (Job 42:3). We know a lot more than Job did, but, like him, there is much we don’t know.

Reference: “The Biomass Distribution on Earth” in Proceedings of the National Academy of Sciences (PNAS) May 21, 2018

January 6, 2023January 4, 2023

Orphan Crops to Provide Food

According to the National Science Foundation (NSF), more than 34 million people in the United States do not have enough food to eat. The NSF is funding research into orphan crops to provide food.

The groundcherry is a member of the nightshade family of flowering plants that includes tomatoes, potatoes, eggplants, and bell peppers. Although its relatives are important crop plants, groundcherries are called “orphan crops” because they grow wild and have no agricultural value. Groundcherries are common all over America, are easy to grow, and can be modified genetically. They have a papery, balloon-like husk or inflated calyx surrounding the berries.

Using the CRISPR genome editing tool, researchers funded by the NSF are working to modify groundcherries and other orphan crops to provide food. Zachary Lippman and Jia He of the Cold Spring Harbor Laboratory feel that the groundcherry has a significant untapped potential to make it useful as a food for humans. They hope their research will lead to new food sources from various plants to build and advance a bioeconomy that will eliminate hunger on our planet.

Understanding the design of a plant that might have been considered unusable or even toxic in the past can lead to a new food source. In the distant past, people thought tomatoes to be toxic. We may find ways to use other orphan crops to provide food. Many familiar plants may have the potential to strengthen food supplies.

God gave us plants to directly or indirectly provide food for all of us. However, we have much to learn about God’s design in the plant kingdom, and we have only scratched the surface.

Reference: National Science Foundation Research News for November 30, 2022.

January 5, 2023January 4, 2023

Survival Requires Change

We are entering an interesting time of change for living plants and animals on planet Earth. We are in a period of rapid climate change, and for many living things, survival requires change. However, for some life forms, this is not an issue. For example, omnivores, animals that eat a wide variety of foods, can change their diet to whatever is available. For example, bears in Alaska eat salmon, but if that is not available, they eat insects, nuts, plants, rodents, and marine shore life such as clams.

For other animals, the situation is much more complicated. For example, giant pandas rely on bamboo for food. Not only is their digestive system designed to eat only bamboo, but even their hands and fingers are designed to modify the bamboo so they can eat it. Polar bears rely on ice flows to get the seals that make up most of their diet. With much of the ice in polar areas melting, the bears cannot secure food, and starvation threatens many of them.

Survival requires change, and for some animals, that means migrating to a different place where they can find their dietary needs. As the oceans warm, cold-water fish migrate to northern areas. Some corals are establishing new colonies in different places as conditions where they have lived for centuries no longer meet their needs. On the other hand, animals with specialized equipment, such as pandas, will face extinction. Humans can step in with temporary solutions, but eventually, some forms of life will cease to exist. That is not necessarily a bad thing.

The fossil record shows us that survival requires change. A significant change in the climate caused the extinction of the dinosaurs. However, that eventually provided a climate and atmosphere where humans and the animals we depend on could thrive. Asteroid material did not directly destroy the dinosaurs, but the asteroid collision changed the climate. That change produced an environment in which dinosaurs could not survive, but it led to the formation of a climate ideal for humans.

Genesis 1:2 is an interesting passage. A possible translation of the verse is, “And the earth became wasted and emptied, and darkness was upon the face of the deep place.” That would indicate a change in Earth’s condition. God has used such changes to accomplish His will. The flood of Noah was not primarily an environmental act but a response by God to the sinfulness of humans at that time. Climatic change is another tool God has used in the past. In geologic time, there have been periods of hot and cold, and survival requires change. The current change in Earth’s climate is not solely caused by humans. We may contribute to the process, but humans are not the sole cause.

God’s creative processes don’t involve “magic tricks.” Instead, God uses natural methods to shape and mold planet Earth. Some animals, such as dinosaurs, have played essential roles in contributing to the resources that humans would need. When they had completed their mission, a change brought about their extinction. The Bible doesn’t tell us how God did what He did, but the more we study the creation, the more we understand some of His processes. Climate change has been one of them and may be so again.

January 4, 2023January 3, 2023

How Frogs Swallow Their Prey

Most of us know that frogs extend their tongues which stick to their prey, and then draw it back into their mouths. High-speed videos show that frogs unroll their tongues like party horns and wrap their targets in an adhesive hug. What science has not understood is how frogs swallow. What happens when they close their mouths? Rachel Keeffe is a National Science Foundation Graduate Research Fellow who has released a study showing how frogs process whatever their tongues bring into their mouths.

Keeffe and her colleagues attached metallic beads at various points in the mouths of cane toads, among the largest frog species. They wanted to study what happens to food once it is in the frog’s mouth. There is a very complex system of cartilage and muscles traveling so far down the frog’s throat that it butts up against the heart. Once there, chemicals secreted in a stomach-like chamber digest it, bringing the nutrients into the frog’s vascular system.

When we examine how frogs swallow, we see that even the simplest life forms have highly complex systems. Frogs control insects and other forms of life that threaten humans. In turn, a variety of birds and fish eat frogs. The world around us speaks volumes of God’s wisdom and design, allowing life to exist on Earth. Romans 1:20 tells us that we can know there is a God through the things He has made. We see that again in the design of how frogs swallow.

Reference: NSF.gov

December 30, 2022December 30, 2022

The Appearance of Design

Look around, and you will see amazing things in the natural world that give the appearance of design. Atheist evolutionary biologist Richard Dawkins has said that biology is the study of things that give the appearance of having been designed. But, of course, he does not believe they were designed because he does not believe in a designer. Is he correct, or is there a better explanation for the appearance of design? Here are some links to past articles in which we have dealt with that topic:

The Problem of Beauty

Is Design in Nature an Illusion?

Designing a Planet to Support Life

Marvels of Engineering in Nature

Designed with Purpose and Beauty

What Design Looks Like

Does Intelligent Design Destroy Science?

Those are just a few of the past articles on design that show evidence for a Designer. We believe that God has given us two revelations of Himself. One is His creation, and the other is His written word. The authority of the Bible is another subject we have dealt with often. Tomorrow, we will share some links from past articles on that topic.