Properly use a multimeter and an oscilloscope.
Maintain a Linux server via the command line.
Tie a bowline.
Convert between inches and mm.
Design a printed circuit board.
Write a javascript program.
Drill and tap a hole for a machine screw.
Hook up an audio/video system.
Set up a wireless router.
An inside bowline, an outside bowline,
running bowline, French, Spanish, and bowline on the bight.
I know some tricks for using half an upset or a full upset to form the entire bend rapidly, and without using those "tricks" can otherwise tie the bend facing away from me or towards me, and either way if I was hanging upside down.
But none of those are the full meaning of tie a bowline, for that has been lost to square-rigger days.
It also meant to rig square rig sails to function [enough] as fore-and-aft rig to go to weather, at least enough to claw one's way off a lee shore or otherwise make headway towards a destination, provided one could find a clear run without be blocked by protruding headlands.
That's the trouble with guys like Obama. Politically, all they can do and all they want to do is sail "progressively" with the prevailing downwind easy tack which is taking us to the hard of lee shores.
Once I was in Ireland a'digging turf and taties.
Way, haul away, we'll haul away for Rosie, Oh.
But now I'm on a Yankee ship a'hauling on the braces.
Way haul away, we'll haul away Joe.Way haul away, we'll haul for better weather.
You call yerself a second mate, an' cannot tie a bowline;
Way haul away, we'll haul away Joe.
Way haul away, we'll haul away together.
Way haul away, we'll haul away Joe.
Way, haul away, we'll haul away for Rosie, Oh.
You cannot even stand up straight when the packet she's a rollin'.
Way haul away, we'll haul away Joe.