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Ask Dr. Universe August 2017

Dr. Universe: Why are there different blood types? - Sarah, Tacoma, Wash.

Dear Sarah,

At this very moment, several quarts of blood are circulating through your body at nearly 4 mph. But as you’ve pointed out, not everyone’s blood is the same.

Your question made me wonder exactly what we mean when we talk about blood types. I decided to ask my friend Amber Fyfe-Johnson, a researcher at Washington State University who studies cardiovascular diseases--diseases of the blood vessels-- in kids.

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Dear Dr. Universe: HOW DOES WATER IN THE OCEAN MOVE? I THINK IT’S BECAUSE OF THE WIND. –Case, 5, Yakima

Dear Case,

You know, most cats like to stay a comfortable distance from water.

But when I got your science question about our big ocean, I was ready to jump right in.

Ocean water moves in all kinds of ways. Waves curl and crash on the shore. Big conveyer belts of water, currents, flow for thousands of miles around our planet. The tides go out and come back in.

And yes, the wind plays a big part in all of it. That’s what I found out when I went to visit my friend Jeff Vervoort, a … » More …

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