A report titled “Your TV can see through walls” sparks discussion about how everyday devices can be used for surveillance, from fiber-optic cables that pick up sound-induced light changes to WiFi/LTE sensing and sensitive security-camera microphones that can reveal activity inside a home. Commenters note this extends a long history of side-channel snooping such as CRT emissions and Van Eck phreaking, and warn that phones and connected gadgets already make location and activity tracking hard to avoid.