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how do polarised sunglasses work

Polarised sunglasses have filters that block some light waves while letting others through. ... read more

people who study animals

There are many things about animals that can be studied. We study their anatomy, their behavior, and how they live in the wild. We also learn more about our own bodies, behavior, and development when we look at other animals. We study how animal life can have an affect on humans and how humans can hav... read more

forging the blade

How to make the perfect killing machine. ... read more

the life cycle

The stages of human life are often described as a life cycle. For each individual, however, life is a straight line. Like a story, it has a beginning, middle, and an end. The earliest stage of life is a single cell. The cell divides and, with instructions from genes, forms different tissues. These tis... read more

why does it hurt so much when you step on a plug

Balancing your body weight on the pins of a plug puts huge pressure on your foot. ... read more