See and Avoid
On another thread is mentioned a midair collision in Canada on 30 June, between a glider and a Cessna 150; four fatalities .....The Canadian Safety Board will no doubt issue a comprehensive report in due course.
Goes on to say that midair collision is one of four most usual cause of fatal accidents in gliders. I know the British Gliding Association does keep track of these accidents in the UK, is this done for all of Europe as well? and the rest of the world?
Gliders make a habit of flying very close to each other in thermals, eyes on stalks, and head swiveling to keep track of those nearby, but the pilots do wear parachutes. The midair between a Tutor power plane and a glider near Didcot a few years back, the problem was the Tutor pilot could not because of a physical problem turn his head well enough to see and avoid, so hit the glider from behind. Another midair near Aylesbury between a K13 glider and a power plane also seemed to have occured in the same way, the power pilot didn't see the glider and hit it from behind.
A midair can spoil your entire day.