Why does skin wrinkle when it is exposed at length to water?
The skin on the foot or palm of the hand wrinkles when exposed to water because it expands.
The thick, hardened layers of skin swell as water is retained.
Neutrinos are objects produced by the decay of certain subatomic particles. They have energy but little or no mass, and they travel almost at the speed of light.
Hailstones begin as frozen raindrops or pellets of snow in a thunderstorm cloud. These “hail embryos” are carried by updrafts to a part of the storm where droplets of water exist in a supercooled state (that is, in liquid form at temperatures below freezing). These supercooled droplets freeze into ice when they strike the surface…
Plastics are only one kind of polymer, a substance composed of very large chain-like molecules that consist of smaller, repeating chemical units. Natural polymers include proteins, cellulose, diamonds, and quartz. Besides plastics, man-made ones include concrete, glass, and paper.
In our galaxy alone, there are about 100 billion stars. In the universe that we can see, the number of stars is estimated at 10^22.
An average bolt of lightning raises the air temperature along its way to about 50,000 degrees Fahrenheit.
Assuming that the heart beats at least once a second, by the time a person is 70, his or her heart will have beat at least 2.8 billion times.