Mars is about 62,000× wider than the International Space Station. Yet in this photo, taken by Tom Glenn in 2020, the ISS appears larger. Here’s why: - The ISS is 109 m across but only ~400 km above Earth, giving it an angular size of roughly 50 arcseconds. - Mars is 6,800 km wide, but was about 62 million km away, giving it an angular size of only ~22 arcseconds. So despite being vastly smaller, the nearby ISS looked larger in the sky. Capturing this photo was not easy: the transit was visible only along a strip of land about 90 meters wide, with the ISS silhouette sweeping across at an equivalent ground speed of 7.4 km/s. Tom Glenn had to be in exactly the right place, point his telescope in exactly the right direction, and nail the timing to a fraction of a millisecond. The final image was extracted from a video frame with an exposure of just 0.00035 seconds.

Voyager 2 launched exactly 49 years ago today - 16 days before Voyager 1, which took a faster trajectory and overtook it. Voyager 2 remains the only spacecraft to have visited Uranus and Neptune and is still communicating with Earth from interstellar space, over 13 billion miles away.

I'm excited to announce the most ambitious recreation of Bloom's 2Sigma study of the last 40 years. It's funded by @reedhastings and staffed by a team of 20 of the best educators in this country. Our education team's goal is to show the largest academic gains in one year ever recorded, and we'll publish our results even if we fail. Recently, @jwdanner introduced me to @reedhastings. Most people know Reed co-founded Netflix. Fewer know he has been one of the driving forces behind improving education for the last twenty years. When Reed pitched me on recreating Bloom's famous 2-sigma problem, I felt an overwhelming sense of hope for education. Over the last few months we have moved at breakneck speed to assemble an exceptional team. Someone recently described it to me as the "Avengers of education." We are testing one question with the rigor it deserves: can elite one-on-one tutoring reproduce the largest learning gains ever measured in a controlled study? We will work with researchers from Stanford, Brown, Cornell, and other leading institutions, and we intend to be the most transparent research group in the field. That means publishing our methods, our benchmarks, and our results, whatever they show. We will invest up to $100,000 per year per student to give them the best education on the planet. If it works, the data and methods can help educators and technologists recreate these outcomes for every child. We are actively hiring tutors, engineers, and operations people to help us climb this mountain.

Goal nine hundred and seventy six and the Portuguese dream lives on. No one’s heart beats like his: Penalty prep: 144 bpm @cristiano goal: 157 bpm Go-ahead goal: 134 bpm Win secured: 141 bpm