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The most powerful muscle in the human body is the heart. The average person's heart beats about 100,000 times per day and pumps about 2,000 gallons of blood through 60,000 miles of blood vessels. If you could count one heartbeat per second, it would take you more than five hours to count 100,000 heartbeats. Dolphins sleep with only half of their brains at a time so that they can continue to swim while they are asleep! Your fingernails grow about 1 mm every month and will grow up to 4 inches in one year! Sea otters hold hands when they sleep so that they don't drift away from each other. A group of owls is called a parliament. There are more stars in space than there are grains of sand on earth! A group of kangaroos is called a mob. The largest rodent in the world is the capybara, which can grow up to four feet long and weigh over 100 pounds!