It is amazing how many things, which used to be done with two hands, are now done with only one hand. It worries me to watch a parent manoevering a child in a baby buggy off a bus or train literally single-handed, often while looking at a mobile ‘phone screen.
Why only one hand nowadays? The answer is simple. Many people seem incapable of going anywhere or doing anything if one hand does not hold a mobile ‘phone or maybe a bottle of water.
Why is it necessary to be permanently attached to a ‘phone? It can be kept in a bag or pocket within easy reach thus freeing up the hand for more productive uses.
And, what has happened to human metabolism that requires a bottle of water to be carried about? I might be old-fashioned, but several decades ago, nobody felt it essential to carry a personal water supply. Have we become more thirsty as a species, or what?