The unique and geeky valentines cards they produce have been released for 2018 and the theme this year’s set features parallel lines, friction, and activation energy. Established in 2006 the unique and geeky blog has created these cards every year.
Their blog is at: https://www.evilmadscientist.com/
Download the 2018 Valentines cards at:
Get the full set of 36 cards for all 6 years at: