What is the greatest invention ever made?

indoor plumbing gets a vote from me too!

. . .

Telephone.

Telephone added to it the computer/smart phone & all the social media attached to it & the camera.....it has created a communication as was never possible before....TV brought a new level of powerful communication at the time of Kennedy & his assassination & with technology being made smaller & smaller & more & more portable & powerful for the individual person's ability to own......life is nothing like it was back in the 60's. The growth has been exponential on comparison as to how slow things were invented in earlier times.

Every invention was important as the stepping stone for the next phase & development.

Self Governance

We take this idea for granted because it is the norm for all of us here. However the idea that people are sovereign unto themselves, with the ability to elect and employ those folks to carry out their collective will is still a relatively new idea in human history.

entrepreneurship

We often take this for granted too, but it is the ability to choose to work directly for one's own benefit that has led to almost every major innovation in the last 200 years.

the absolute nuclear family

The concept, which originated with Germanic tribes during the Roman empire, and passed on to England during the middle ages, is in large part responsible for the rapid rise of the US to pre-eminent world power. Our political/social/and economic structures our founded on the ANF.

the graphing calculator! Yep, I am such a nerd :-)

The hot shower. Would give up the dishwasher over a hot shower

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Any and all types of water filters------but especially reverse osmosis types.

scoopable cat litter

Impossible to answer really but i would say antibiotics are pretty high up there...

Uhm, how bout the world wide web?

Not THE best but one of the smartest, ham radio and the Morse code.

The best... I'd say agriculture.

Also what lead to humans being the parasite of earth finally but meh.

Is water in Canada that bad you need to filter it

Coffee, the only thing that wakes me up in the morning. Definitely coffee.

My vote goes for toilet paper.

Big loool

Impossible to choose just one! What is peanut butter without jelly? !!!! Good question though. I couldn't choose just ONE of my children either though lol.

Water is putrid in south Australia and must be filtered.

Some really great suggestions here though.

ANDREWS wet wipes for your bum, make toilet paper feel like sand paper, great for the old piles, no more old fashioned bog roll for me.

Penicillin

The washing machine, I don't know how anyone could ever cope without one.
I know years a go everyone did their washing by hand and when I think of that I imagine how it was, I wash everyday so yeah I go with the washing machine.

Too bad sleep's not an invention but I have to agree with Seeker - toilet paper is pretty incredible

not for me I am allergic

Without filtered and safe water, not much else is gonna happen, anywhere....

I am speaking historically. Safe drinking water was at the forefront of everything that followed , socially and medically.