A sonogram can see your heart beating too, but no one thinks sonograms are dangerous(because they are not).

▲ elric 5 days ago | parent | next [-]

Ultrasound can be used to blast tumours or break kidney stones. And according to Wikipedia there seems to be a really weird correlation between having an ultrasound and being lefthanded. But that sounds almost too ridiculous to be true.

▲ transpute 5 days ago | parent | prev | next [-]

Unsolicited remote sonograms are stopped by walls, floors, ceilings and doors, unlike wireless radio networks.

▲ ch4s3 5 days ago | parent | next [-]

A concrete wall stops wifi pretty well.

▲ transpute 5 days ago | parent [-]

How thick a concrete wall is needed to stop wifi? Or does the concrete wall contain fine wire mesh?

▲ dilyevsky 5 days ago | parent | next [-]

If by "fine" you mean minimum ~10mm rebar then yes

▲ ch4s3 5 days ago | parent | prev [-]

Have you never walked into a building an lost cell reception?

▲ transpute 4 days ago | parent [-]

Found a table with attenuation by frequency and building material, e.g. low-emission glass can block more than concrete, https://www.signalbooster.com/blogs/news/how-much-which-buil...

                        800Mhz     1900Mhz
  1/2" Drywall          2.03 dB    2.43 dB
  Venetian Plaster      7.91 dB    16.22 dB
  6" Concrete Wall      10.11 dB   19.41 dB
  Glass Window          4.35 dB    4.38 dB
  Low Emission Glass    33.8 dB    33.8 dB
  Brick                 7.57 dB    14.66 dB
  Solid Wooden Door     6.11 dB    12.33 dB

▲ bookofjoe 5 days ago | parent | prev [-]

For now

▲ KingLancelot 5 days ago | parent | prev | next [-]

[dead]

▲ pessimizer 5 days ago | parent | prev [-]

Sound can certainly be dangerous to you.

	▲	ceejayoz 5 days ago \| parent [-]
		So can water. That doesn't make it inherently dangerous in all amounts.