Answer:
Some of the sports people enjoy in Winter, including skiing, snowboarding, sledding, and ice skating can be dangerous. Make sure you wear the right gear and that your equipment is in good working order. And always follow signs posted at skiing and skating areas. Even cold weather itself can be very dangerous if you aren't properly dressed for it. Both people long ago and people today also wore more clothes in Winter. Today we have man-made materials that are much warmer and yet thinner than people had in the past, but we still layer them for going out in the snow.

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Kids Health: Safe Winter Sports
http://www.kidshealth.org/kid/watch/out/winter_sports.html
Find ways to stay safe while practicing your favorite indoor sports and also check out the glossary for definitions of Winter dangers like frostbite.

Dress Like a Polar Bear
http://www.wildeducation.org/programs/below_zero/activity/drspolbr.asp
This kid-friendly site by the Canadian Wildlife Federation explains how people's layers of clothing help us adapt to cold temperatures, much like polar bears' layers of fat and fur help them keep warm. There are also activities for teachers to use in the classroom.

GORP: Layering
http://www.gorp.com/gorp/gear/features/layering.htm
Learn more about layering clothing to stay warm this Winter. This site also describes how modern fabrics can keep you warmer.