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What’s happening in your body that causes the sensation of fatigue? Not the macro causes like poor sleep, etc. Decrease or increase of a particular hormone or something along those lines?
Why did the Laurentide Ice Sheet form and receed like it did?
How are the varying kinetic energies and momentums from different reference frames balanced when dealing with relativistic speeds?
How many stars in the sky don't exist?
What does an unborn baby have in it's lungs?
Why are there dunes?
In placental mammals, does the placenta come from the embryo or the mother?
Why is there a visible cone of a tornado when it’s made of rotating air?
do we have more or less trees than we did 30 years ago?
Does being exposed to a disease during a period of immunity prolong your resistance?
Why five fingers? Why not 3, 7, or 9?
What causes arctic animals to shift between summer and winter coats?
Are there invasive species from the Americas in Africa/Asia/Europe?
Mt Rainier lasted erupted in 1450 CE and has a pointy peak. How long does it take for a volcano to turn into a peak?
How long would it take for the land under antarctica to fully resurface if all the ice above it dissappeared this instant?
How long does an `evolution` of a rhinovirus last before going extinct?
Is energy actually conserved?
How can gene edits prevent viral infection?
It is widely said that age of the universe is around 14 billion years. According to whom?
Why did NASA's Orion capsule change colour after reentry?
Why were there massive spikes in exoplanets discovered in 2014 and 2016?
How does both nuclear fusion and nuclear fission release energy?
Axiomatic definition of classes of L functions?
How exactly does the Pauli Exclusion Principle play a role in contact forces vs electrostatic repulsion?
Why is one side of the Mississippi River flat, and the other side hilly?
What dictates which field is excited in QFT?
If moving at near (90+%) light speed, can a person travel 'n' light-years and experience LESS than 'n' years, or is their minimum perceived travel time equal to the number of light years in the journey?
What were all the small explosion tests in Oppenheimer?
How is the Internet speed at the ISS over 1GB/sec?
Which river on earth is currently changing its course the fastest/slowest? How can we tell?
How do birds know which way is south?
How do researchers quantify depression,anxiety,bipolar etc in mice models?
Can crows from different regions communicate?
How can eyes heal themselves when they have immune privilege?
How fast do macrophages move around?
Why do some insect fossils still have colors ?
How does lactose enter lac operon?
What is the deal with co-occurring allergies that don't make sense in terms of clades?
What's the layman definitions for the SI units?
Why can't cats with FIV (Feline Immunodeficiency Virus) be given medication for HIV (Human Immunodeficiency Virus)?
How do researchers give lab rats cancer?
Why do banana peels connected to the banana turn black in the fridge even if not ripe?
What's the limit to the placebo effect?
Do octopodes change color beyond the visible spectrum of light?
Is the flavor of a strawberry concentrated in certain parts of the fruit, or is it distributed evenly throughout?
Why is body/facial hair such a strongly sex-linked trait in humans? Is there any potential evolutionary reason for it being correlated with testosterone and present largely only in males?
if you put a scale underwater with the face pointing up, would it show the weight of the water above it?
How is it possible to hear sound under water?
How do ecosystems function?
What are the fundamental forces of nature?
How do electric and magnetic fields interact?
What is the process of mitosis and meiosis?
What is the significance of the Hubble Space Telescope?
What is evolution?
Why do leaves fall in autumn?
Why do we have seasons?
How do planetary rings form?
How do cameras work?
Why does salt melt ice?
What are allotropes and how do they differ?
How do hormones regulate bodily functions?
What is a supernova?
What causes thunder?
What is the role of ribosomes in protein synthesis?
What causes earthquakes?
How TVs switched from b&w to color?
What are the different types of sedimentary rocks?
What is the periodic table and how is it organized?
What is the role of environmental monitoring in protecting ecosystems?
What are the processes of tectonic deformation?
What are the effects of urbanization on natural habitats?
How does light behave as both a wave and a particle?
How do we study and manage air quality?
What are the effects of land use change on ecosystems?
What is the role of conservation biology in protecting species?
How do we study and protect wetlands?
why are heartbeat, pulse, breathing like a wave? Why do wave exists in the universe?
What is the role of neurotransmitters in the brain?
What are the layers of the Earth?
How do plants reproduce sexually and asexually?
What is the role of geochemical cycles in the Earth's system?
How are mountains formed?