Southern California Edison wants to change the plant's federal operating rules to permit the Unit 2 reactor to run at no more than 70 percent power, which company engineers and consultants believe will limit unusual tube wear.

NPR: San Onofre Submits Draft Linked To Restart Bid

Forecasters say people should limit outdoor activity during the hottest portions of the day, wear lightweight clothing, drink plenty of water and be watchful for signs of heat exhaustion, which include heavy sweating, pale and clammy skin, weak pulse, fainting and vomiting.

CNN: Heat advisories issued to states dwindles to 15

Many scientists believe there is a set limit to lifespan because the body's organs and tissue begin to wear out at a steady rate over time.

BBC: How old can we get?