Satellite radar see through clouds. Using interferometry from multiple passes, it can detect mm movement of ground (to predict landslides) and bridges (to detect failure earlier.) Military applications abound - in tracking enemy vehicles in any weather.
Reflected radio waves can reveal a lot of information about things moving nearby. And, at a global scale, satellites can track ships that have "gone dark" for nefarious purposes.
And this tech is simple and cheap - in this video, a single chip setup could read her heart rate and breathing through walls.
Just one night of exposure to 100 lux (equivalent to a streetlight shining through a curtain) during sleep impairedglucose tolerance the next morning. It also "increased heart rate and sympathetic [nervous system] activity during the entire sleep period."
This was studied in 20 healthy young adults 18-40 years old, and the moderate-light condition was four 60-watt incandescent overhead ceiling light bulbs (a total of 100 lux).