Sounds and silence: The silence comes between the attempts to peel the apple whole. There is a slight scuffing of the chair on the floor, crispness of the apple to a metallic touch, muffled sounds of starched apron folds. The chair creaks from having been stored next to the boiler in the basement, suffering effects of 15 years of dry heat.

On the Visual History of Silence – a beautiful meditation on how a set of vintage photos of housework postures actually offer “a map of the silences encountered in the daily cleaning of the house.”

Also see the origin and cultural evolution of silence.

Sound frequencies visualized in a vintage illustration from 1930s cigarette cards featuring science infographics

To blow you away, acoustic levitation of liquids – water droplets suspended mid-air by sound waves. Known as standing wave, these high-frequency acoustic signals allowing liquids to “levitate” at the nodes as the two acoustic forces cancel out each other and gravity.

(ᔥ It’s Okay To Be Smart)