Name The Year: US/USSR signed an agreement to discuss joint space efforts.?

Questions

The worlds longest escalator is in Leningrad Metro, ______ metres long?

The fluorescent tube uses ___% of the power to produce an equal amount of light as a tungsten filament bulb?

The tip of a rotary mower travels at over _____ km/hr?

In an atom, the electron weighs _________ th of the weight of the proton?

The world's oldest man-made alloy is?