Enlarge (credit: Getty | Thomas Trutschel)

Just because something is safe to eat or drink doesn't mean it's safe to squirt deep inside your face, like your sinus cavities and eye sockets, researchers at the Centers for Disease Control and Prevention would like to remind you.

In a study published Wednesday in Emerging Infectious Diseases, CDC researchers looked at 10 cases where people developed life-threatening amoeba infections after cleaning out their sinuses, often with tap water via neti pots and squirt bottles. Such infections are relatively rare, but the number of people at risk of them is perhaps much greater than one might expect.

In a survey study published last year, researchers found that an alarming number of people in the US were completely misinformed about the safety of tap water for home medical uses. For instance, 33 percent of people incorrectly believed that US tap water is sterile, containing no living bacteria or other germs. Moreover, 62 percent of people wrongly thought it was safe to use tap water for rinsing your sinuses, 50 percent said it was safe for rinsing contact lenses, and 42 percent thought it was safe for cleaning respiratory devices.

• 

  The Oppo Find X7 Ultra features some faux leather and a really big camera bump. [credit: Oppo ]

Oppo's newest flagship is the Find X7 Ultra. This phone's claim to fame is having two periscope camera lenses on the back. Like most Oppo phones, this will land in China first, probably Europe later, and won't come to the US.

The X7 Ultra is all about photography, with four 50 MP sensors on the back. Periscope camera No. 1 is a 50 MP 3x telephoto that uses a 1/1.56-inch Sony IMX890 sensor. Oppo says "this sensor is roughly three times larger than the equivalent cameras in key competitor systems, and is the biggest telephoto sensor in any smartphone." Periscope No. 2 is a 6x telephoto with a 50 MP, 1/2.51-inch Sony IMX858 sensor—so more zoom, but less image quality. The main camera is Sony's top-of-the-line LYT-900 1-inch sensor, and the wide-angle is a 50 MP Sony LYT-600 sensor.

Packing all these large cameras onto the back results in a big camera bump. Despite the phone being a normal-sized 6.8-inch device, the camera takes up about a third of the back, and it almost looks like you'll be touching it when you're naturally holding the phone.