Mind Stretch: Randall Munroe, creator of xkcd

keeping an eye on how gradually the dotted line moves sideways, until it’s not gradual at all. [Read more]


Neither flesh nor born of flesh

“Having thus in process of time been clothed with a strong coat of feathers, they either fall into the water or fly freely away into the air. They derived their food and growth from the sap of the wood or from the sea, by a secret and most wonderful process of alimentation.” [Read more]