While flying over a town at night, if you can see streetlights, then somebody’s paying for them to also illuminate your plane

— Neil deGrasse Tyson (@neiltyson) May 1, 2017

If half the light of a streetlamp goes up, then a shade could reflect the light downwards, requiring only half the wattage.

— Neil deGrasse Tyson (@neiltyson) May 1, 2017