Each year, it’s fun to celebrate birthdays. If we’re not sure of someone’s age, we can always check their birth certificate. But can any reliable methods determine the age of an object without a historical record?
While bats live in air and dolphins live in water, both use a biological form of sonar technology called echolocation to see with sound! The specifications in dolphin and bat biosonar systems are so many, so well-integrated, and so precise, could they really have developed at random in two completely different environments?