I might be a bit different from many other professional scientists - I can actually use my hands. I was a kid in the 1940s and 1950s. I had an uncle who was like a brother to me. He had a 1953 Triumph Thunderbird which he rode from Melbourne to the Atherton Tablelands in North Queensland. When he returned I helped him rebuild the bike. In 1954 he took me to a road race meeting at Fishermens' Bend where I watched Geoff Duke ride the Gilera fours. I just had to do that. When I was working, I manoeuvred so that whatever I did was associated with manufacturing hardware. I've had motorcycles since I was 15 - about 1955. In those days bikes were as cheap as chips. I had two given to me. I can drive a lathe and a mill and I can weld a bit. I have rebuilt many motors and gearboxes. In the four factories in which I have worked, there was sufficient expertise to build the best motorcycle on the planet.
I was watching a TV programme on the ABC a while back. There was a panel of experts and one of them said 'I wish I could fix a gate'. They went around the panel and none of them had any manual skills. Why would you be born with hands, if you were not going to use them ?