Before James Clerk Maxwell and his famous equations, the speed of light was believed to be variable. Ole Rømer first estimated the speed of light in 1676 by observing Jupiter's moons, and his estimates were within 25% of the current value. Later, in the 19th century, the French physicist Hippolyte Fizeau conducted a laboratory experiment and came up with a more accurate measure. But, it was Maxwell's theory of electromagnetism that eventually led to the understanding that light speed is constant.
Max Planck (1858-1947) on matter and force ✍️
As a physicist who has devoted his whole life to rational science, to the study of matter, I think I can safely claim to be above any suspicion of irrational exuberance. Having said that, I would like to observe that my research on the atom has shown me that there is no such thing as matter in itself. What we perceive as matter is merely the manifestation of a force that causes the subatomic particles to oscillate and holds them together in the tiniest solar system of the universe.
Since there is in the whole universe neither an intelligent force nor an eternal force (mankind, for all its yearnings, has yet to succeed in inventing a perpetual motion machine), we must assume that this force that is active within the atom comes from a conscious and intelligent mind. That mind is the ultimate source of matter.
-- as mentioned in a 1944 speech in Florence, Italy.
📷colorized by Sunny Labh
It's easy to dismiss people we disagree with.
Especially online. But imagine if we treated them with dignity.
That doesn't mean agreeing with them. It means recognising their right to be wrong.
Even when they don't reciprocate.
What might that look like?
#Ship30for30
I'm discussing “💡⚡️African Innovation Hub 🙋🏾♀️🙋🏿♂️” with Bonnie Kim, @Poshmamy, @shawnykung, @oniemma4, Chidera CC and Founders Club. Today, 14 Mar at 8:00 pm GMT 1 on @joinclubhouse. Join us! https://t.co/Ug5AVEV2v9
By the way, #EndSARS trends number 1 in Nigeria, in the USA and in the world right now.
The Nigerian Govt understands the global shame and disgrace that comes with this widespread massive shaming.
Guys do NOT stop tweeting.
Ladies do NOT stop retweeting.
LET THE WORLD HEAR US.
2020 was a bumpy year but Thank God I made it through and I am not giving up now. I have made it into my final year of PhD studies as a 23 year Old Nigerian female but I need your help. Can you please read my story and help RT.
Thanks and Happy New Year!
https://t.co/zlEo64bsF8
MYTHS VS REALITY: ENGINEERING EDITION 👷🏿♀️🦺🏗️
Happy to share the content I created for the @theERAF for @born2engineer to bust the myths behind a career in engineering!
Full video: https://t.co/Ada6e0gFyt
#STEMeducation#BlackHistoryMonthUK