Which religions are the most widely practiced around the world?

Today there are some 4,300 religions in the world. Nearly 75 percent of the world’s population practices one of the five most influential religions of the world: Christianity, Buddhism, Hinduism, Islam, and Judaism. Christianity, which is based on the teachings of Jesus Christ, who preached in Palestine about 2,000 years ago, is the most widely practiced religion in the world today, with 2.1 billion followers.

The second most practiced religion is Islam, with 1.3 billion followers.

What do I do if I am being bullied?

Lots of kids have been picked on by a bully, for many different reasons. Bullying is intentional tormenting in physical, verbal, or psychological ways, and can range from hitting, shoving, name-calling, threats, and mocking to taking lunch money or personal items. If you’ve been the target of a bully, you know it can be very scary and upsetting to be teased, hit, or threatened.

Sometimes it helps to simply ignore what the bully is saying—most bullies tease or threaten other kids to get a reaction from those they tease, and if they get no reaction at all, it’s a lot less fun for them. It usually helps to have friends around. A kid walking alone is more vulnerable than a group of kids. And even if you don’t feel confident, sometimes acting confident helps. If you hold your head high and tell a bully to stop calling you names, you may just surprise that bully into silence. One approach to avoid is responding to bullying with fighting or bullying back—aggressive responses will only make matters worse.

What is the International Date Line?

Located at 0 degrees longitude, the prime meridian passes through Greenwich, England. Halfway around the world in the middle of the Pacific Ocean (180 degrees from Greenwich) is the International Date Line (IDL), where the date changes across the boundary of the time zone.

The entire world is on the same date only at the instant when it is noon in Greenwich, England, and midnight at the IDL. At all other times, there are different dates on each side of the IDL.

Why is Earth mostly crater-free compared to the pockmarked Moon?

Earth is more active, in terms of both geology and weather, which makes it hard for craters to remain. Even those craters scientists can see on the surface—which may be millions of years old—have been overgrown by vegetation, weathered by wind and rain, and changed by earthquakes and landslides. The Moon, meanwhile, is geologically quiet and has almost no weather, so its hundreds of thousands of craters are easy to see.

The craters are the result of both meteorites and volcanic activity. Interestingly, some of the oldest Earth rocks might be awaiting discovery on the Moon, having been blasted there billions of years ago by asteroid impacts that shook both worlds.

How does a cat’s tail help keep the animal balanced?

Almost 10 percent of a cat’s bones are in its tail, and the tail is used to maintain the animal’s balance. A cat’s tail plays a vital part in its “righting reflex” that allows it to land on its feet after falling from a height. Cats often survive a long fall based on their agility and balance, which they develop as kittens. When falling, the fluid in the inner ear shifts and the cat rotates its head until it equalizes and the fluid is level.

The body automatically shifts to follow the head, and the cat lands on its feet. A cat also uses its tail to communicate. A cat’s tail held high means that it is happy. A twitching tail is a warning sign that it may be angry or on guard, and a tail tucked in close to the body is a sign of insecurity or fearfulness.