#877 Why do we have a leap year?
Why do we have a leap year? We have a leap year because the calendar year doesn’t exactly match the solar year. Earth orbits the sun at an average distance…
Why do we have a leap year? We have a leap year because the calendar year doesn’t exactly match the solar year. Earth orbits the sun at an average distance…
Why does a golf ball have dimples? They make the ball go further. Golf balls didn’t always have dimples. The game was invented in Scotland in the 15th century, but…
What happened to Detroit? Detroit declared bankruptcy in 2013, with debts of $18 billion. Detroit was the fourth largest city in the United States at one point and so large…
Where does cork come from? Cork comes from the bark of the cork oak tree. The primary use of cork is to stop up wine bottles. About 20 billion bottles…
Henrietta Lacks developed cervical cancer and the cells taken from a tumor biopsy have formed the HeLa cell line, named after her. Ms. Lacks didn’t know that her cells had…
Why does dry ice fog sink? The gas from dry ice is more dense than air and therefore it sinks. Dry ice is solid carbon dioxide. It is called dry…
How do animals find water? They have many methods. Some animals can smell or sense water. Some animals get their water through eating plants. Some animals have evolved to need…
Why does a pulley make weights easier to lift? They increase mechanical advantage. The pulley is an invaluable invention that has helped humankind immeasurably. Without it, many of the things…
Can you live without a spleen? The spleen serves many functions, but you can live without it. Having it removed will affect your life, though. Your spleen is just inside…
How does an ejection seat work? In the simplest sense, they remove the canopy to the plane and then launch the pilot on their seat into the sky before a…