The US spent millions of dollars developing the Fischer Space pen with its special pressurized cartridge, special ink etc. for the astronauts to use in 0 gravity. When the details of the Russian space program became available it was found they also had an instrument that met all the same criteria - a lead pencil! Rather like the 5 blade, vibrating, lube striped $4 cartridge vs a 20 cent DE in a 100 year old junk store razor!