
ALT A split-screen image features a lit white candle and orange marigolds on a dark surface with cut-out paper decorations on the left. The right side features a dark blue background with white text reading \"Did You Know? Bright orange marigolds, known as cempas\u00FAchil in Mexico, are closely associated with D\u00EDa de los Muertos and are traditionally used to decorate ofrendas and graves.\"

ALT A dark blue graphic with the Springer Nature logo, featuring text reading \"Did You Know? Everything we can see, from stars and planets to other people, represents only a fraction of the universe's matter. Most is thought to be invisible dark matter.\" To the left is an image of a bat flying across a bright full moon.

ALT A social media post by Springer Nature featuring a black and white portrait of botanist Ethel Sargant. The text reads: \"Did You Know? While caring for her mother and sister, Ethel Sargant continued her botanical research from a small laboratory in the grounds of her family home, which she called\u201CJodrell Junior.\u201D\"











