Who has the biggest brain in the universe?

The sperm whale

Are human brains larger than they were 30000 years ago?

Cro-Magnon man, who lived in Europe 20,000 to 30,000 years ago, had the biggest brains of any human species. In comparison, today’s human brain is about 10 percent smaller. It’s a chunk of brain matter roughly equivalent to a tennis ball in size, McAuliffe says.