Published on 12, July, 2020
I encourage you to reply, but not more than once a day, with a interesting new fact. Let’s stretch this out instead of dumping all the interesting facts out all at once. (Btw feel free to comment on the interesting facts as much and as often as you want)
edit: posting a source for your fact is strongly encouraged.
Do you dunk biscuits in your tea or coffee?
Physicists have calculated a formula for optimal biscuit dunking.
where t is the time for a liquid of viscosity η and surface tension γ to penetrate a distance Linto a fully wettable, porous material whose average pore diameter is D.
Source: Fisher, L. (1999) Physics takes the biscuit. Nature 397, 469 (1999). https://doi.org/10.1038/17203
See also: https://www.independent.co.uk/life-style/food-and-drink/biscuit-tea-dunking-science-b2248551.html
Enjoy!