A list of safety
A list of safety
"A straight line can be readily drawn among each of the two series of points corresponding to maxima and minima, thus showing that there is a simple relation between the brightness of the Cepheid variables and their periods."
Henrietta Swan Leavitt was born #OTD in 1868. Her discovery of how to effectively measure vast distances to remote galaxies led to a shift in the understanding of the nature of the universe. via @Wikipedia
Amazing thunderstorm photos captured at 37,000 feet by airline pilot Santiago Borja.
Web: https://www.santiagoborja.com/
Instagram: https://www.instagram.com/santiagoborja/
We brought a tree from another world
In a way, the future