This 📸 of #Amsterdam from the turn of the 19th century by George Hendrik Breitner is breath-taking! In many ways, the city looks the same…and yet, it's so different.
Don’t be sad it’s over, be proud it taught us so much. Congrats to all the men and women of @NASA on a @MarsRovers mission that beat all expectations, inspired a new generation of Americans, and demands we keep investing in science that pushes the boundaries of human knowledge.
Where your compass points is changing, and no one is sure why - maybe a high-speed jet of liquid iron deep beneath Canada. https://t.co/AqS5QP80t3 @NatureNews
Though it sounds weird, the core of the Earth is about 2.5 years younger than the crust and this is due to gravitational time dilation, a consequence of General Relativity https://t.co/hVqzPxV2I6