The quiz genius questions Google's genius

The world's leading technology company is known for its unique and hiring recruitment questions that make candidates think hard.

Of the 8 billiard balls, one is lighter than the other.With a two-disc scale, you need to weigh at least how many times to find that ball without weighing it?

A man was found dead in the desert with a match in his hand.The scene has no other traces.So why did he die and die?

You have two vases of 5 liters and 3 liters.How do you use these two jars to measure 4 liters of water when the water is not limited?

You build a house, all faces look south.You suddenly spotted a bear.What color is it?

One doctor gave the patient four pills, each with two tablets but they looked no different.The patient must take the medicine twice daily: Each pill is in the morning and evening.If he drinks the wrong way or doesn't drink, he will die.But he accidentally mixed them up, so how to survive?