Grooves in a sandstone cliff reveal ancient tool sharpening . Published:2/21/2024 2/21/2024 • By Jeff Mitton. By rubbing a spear head against stone to form or sharpen it, ... Approximately 70 feet ...

Approximately 70 feet north of the Panel, I found two vertical grooves in the rock. They were about one foot long, about 3/8 inch wide and 1/2 inch deep and in cross section were V-shaped.

The sound of silence is a beautiful thing. Skeptics were dubious last year when the Vertical Groove driver was introduced. More than a few experts didn’t believe vertical grooves on a driver ...

Daly, who led the PGA Tour in driving distance 11 times, will be playing a driver with vertical grooves on its club face when he tees it up in tournaments this year and beyond.

I was so intrigued by the notion of the new Vertical Groove driver that I ordered one up about a week ago for testing, to see if it was really as revolutionary as I’d heard through the golf ...