Strong passwords, keeping software up-to-date and properly patched, and knowing the impact of each piece of the software puzzle as it is added are small ways the end user can add layers of protection.
Baiting mosquito traps with CARDS soaked in honey, and then analysing viral RNA in saliva left by mosquitoes that feed on them, may be a way of tracking the spread of some diseases.
Thrifty though a font like Century Gothic may be, a Dutch company, Ecofont, has found a way to make a font that is even thriftier: by punching holes in the letters.
"You're going about it the wrong way," said Hermione. "Only you can get the memory, Dumbledore says." That must mean you can persuade Slughorn where other people can't.