By Gailon Totheroh CBN News Science & Medical Reporter
Most everyone knows that heart disease kills. Clots in the arteries block blood flow and lead to strokes and heart attacks.

But what isn't so well known is that deadly clots can also come from the veins.

If you're a frequent flier, you may well have heard of deep vein thrombosis, or DVT. That's because sitting for long periods of time can cause clots in the legs that could end up in your lungs.
 
DVT made headlines following the shocking death of NBC journalist David Bloom. His wife...
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