Even in this day and age there are people who think that the earth is flat. The educated people of ancient Greece - about two and a half thousand years ago - had already figured out that the Earth was round. They observed the data that was right in front of them.

Wissenschaft & Technik
Great Moments In Science Folgen
From the ground breaking and life saving to the wacky and implausible, Dr Karl Kruszelnicki reveals some of the best moments in science.
Folgen von Great Moments In Science
249 Folgen
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Folge vom 23.11.2021How the earth is round
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Folge vom 16.11.2021More about the body when free divingWhen diving to very great depths the body has mechanisms to cope - on the way down, and then back to the surface.
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Folge vom 09.11.2021The body and free divingFree diving has a current world record of around 214 m straight down—that's greater than the height of 50-storey building. For thousands of years free divers would collect salvage from shipwrecks to build underwater barricades against invaders.
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Folge vom 02.11.2021Probiotics and Pre-bioticsThe benefits of natural foods have always been a big deal. And there really is a tiny nugget of truth in the proclamations—but it's been greatly hyped