The bone density test your doctor forgot to order You turned 65, got your Medicare card, and scheduled your annual checkup.

For all of cycling's health benefits, bone density isn't one of them, so how are the pros combating the effects that a career in the saddle has on their bones, and what can we learn from them?

Stop bone density loss before it starts. Pharmacist Mar Santamaria explains how to strengthen bones after 30 with the right exercise, diet, and essential supplements.

But what does that mean? The simple answer is how heavy something is for its size. If something seems very heavy for its size (like a heavy metal object), we say it is more dense. If something seems ...

Chinese scientists break a historic barrier and achieve the highest plasma density in a nuclear fusion reactor.