Crows can recognize individual human faces and hold grudges for years

The human nose can detect about 1 trillion different scents

The human nose can distinguish approximately 1 trillion unique odors

How does the unique circulatory system of birds, including the avian respiratory system and air sacs, contribute to their high-altitude flight capabilities?

Birds' efficient oxygen-exchange system and air sacs enable sustained high-altitude flight by maximizing oxygen uptake and minimizing energy expenditure

Which machine learning algorithm is commonly used for image recognition tasks, and what are its underlying principles?

Convolutional Neural Networks (CNNs) use hierarchical feature learning for image recognition

The footprints on the Moon will last millions of years — there's no wind or water to erode them

Moon's lack of atmosphere and liquid water preserves footprints indefinitely

Sharks are older than trees — sharks appeared about 400 million years ago, trees about 350 million

Sharks existed approximately 400 million years ago, predating trees by 50 million years

The first photograph took 8 hours of exposure — taken by Niépce in 1826

Niépce's daguerreotype, first photograph, required 8 hours exposure in 1826