Leo says that the first ransomware appeared on the Mac last week. It was through a bittorrent program called Transmission. A bad guy hacked it and added a malware program to the installer that would encrypt the user's data. It only happened for a few hours though. Apple has also yanked the certificate of the company that tried it, updated the signatures of the malware screener on the Mac, and it's extremely unlikely that anyone else will get infected by it.
Ed has an iPad 4 and he can't print to his Pixma printer. Apple says he can't. Leo says that Apple uses "AirPrint" to print via WiFi, and if the printer doesn't support it, then he'd have to add additional hardware to give it that support. But there may be software that Apple offers for free. Otherwise, Leo recommends xPrintServer. It'll take any USB printer and make it an AirPrint compatible printer.