So it's time to buy some new wheels. What hardness should you get? What do the durometer numbers mean? What's a durometer anyway? Don't worry, we got you. All skateboard wheels are made from urethane, ...

Today, most people admire diamonds for two exceptional attributes: their hardness and their brilliance. Scholars knew of diamonds' unrivaled hardness since antiquity, but its unique optical ...

I know it's part of getting older, but when my husband was told to go to the ER because a clinical trial EKG had revealed an irregular heartbeat, I was startled almost into one of my own.

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