What is so special about sliced bread?

Odd-Strange-Funny ☻ Comment ☻       

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When someone does something good, people will say,

"You're the best thing since sliced bread!"

Man has walked on the moon.

Two people on opposite sides of the world can video chat.

A doctor can save the life of a person with a bad heart with a heart transplant.

So, this is it? Sliced bread? This is the best thing that man has accomplished?