Since I write below about an ancient piece of technology, I thought I should draw your attention to this up-to-the-minute technological feat: skydiving across the English Channel. Yep:
He wore only an aerodynamic jumpsuit with a 6-foot (1.8-metre) carbon fin strapped to his back, an oxygen tank from which to breathe, and a parachute to land.
There were a few problems. A camerman accompanying him in the plane passed out for lack of oxygen. And when the daredevil jumped out of the plane at 30,000 feet, "his legs and glider got entangled and he had to cut his glider into pieces." And he couldn't see through the clouds for most of the flight, and it was freezing cold. Except for those wee setbacks, he apparently had a swell time. He attained a top speed of 225 mph and landed in France 14 minutes after jumping from the plane.
I'll stick with the atlatl.