acheiving resistance with a very close value is possible and it needs much material
Because some are larger than others and some are closer than others.
because some people's are bigger than others
It is completely a result of genetics.
some beer cans are larger than others
Nope, resistors all the way from 0 ohms through 100 megohms come in the same package size(s). Different package size depends on power rating of the resistor, high wattage resistors must be much larger than low wattage resistors to allow them to dump the heat and not burn out. Some very high wattage resistors even have plumbing fitting attached so that refrigerated cooling water may run through their outer case to help remove heat!
Thoracic ganglia are part of the sympathetic system. There are twelve different ganglion, and some are larger than others.
The sun is a star. Some stars are larger than our sun while others are smaller.
Physically, Neanderthals had a larger body mass, bigger muscles, an expanded ribcage that housed larger lungs, a weak chin and a prominent brow ridge.
Some females become physically ill, others just experience annoying discomfort.
It depends on the style, maker, and intended use.
you could get shocked
There are several different species of sea creatures that have shells, and some grow to larger sizes than others.