One was in his early 50's and playing tennis with his daughter. He went back for a lob and just tripped. The other was a successful young engineer in his late

One was in his early 50's and playing tennis with his daughter. He went back for a lob and just tripped. The other was a successful young engineer in his late 30's. He just tripped over a toolbox that was in back of him. They both hit the back of their heads, and neither had any previously known health problems or attacks of vertigo. I don't walk backwards as a rule. But I trip over all kinds of stuff (mostly the kids toys) walking forward. ..