The human eye is like an immunological fortress, with its ability to exclude unwanted intruders a boon when preventing infection but a burden when trying to deliver vital medicines. Researchers in China have now turned to an unusual source—pig semen—to develop eye drops that can deliver cancer drugs to the back of the eye.



When you have a surplus of something you need to start figuring out what it could be used for before your collection overflows
Just get a bigger shoe box.