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Are there places in space we can leave spacecraft without them drifting off?

A Lagrangian point is essentially  a "parking space" for spacecraft, where the forces of gravity balance out to allow a probe to stay in one place with minimal fuel consumption. There are five of these points in the Earth-Sun system, but only two are currently occupied by a total of five spacecraft.


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Does a smart person have more brain ceels than a less intelligent person?

We have around 86 billion neurons (brain cells), but we don't know exactly how many each person has in order to compare. But last year researchers at the Free Amsterdam University found that people with a higher IQ had neurons that were longer, more complex and carried more information around the brain.


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Why do we rub our eyes when we are tired

After a long day at school or in the office, our eyes can begin to feel sore and dry. By rubbing our tired eyes we stimulate the lacrimal gland above the eyeball. which then producers extra fluid to re hydrate the eye. However, rubbing your eyes can actually make you feel more tired.

By putting pressure on the eye, the vagus nerve is stimulated, which can reduce your heart rate, making you feel relaxed and ready for a snooze. Be warned, too much pressure and chronic rubbing can cause a range of health issues, including causing infection of scratching your eye's cornea.


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Why don't humans grow to be ten feet tall?

Humans have evolved over millions of  years, and natural selection has determined our genetic makeup. In fact, between 60 and 80 percent of our height is down to genes, and the rest is influenced by environmental factors, such as nutrition.




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