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It has a density of 1.17–1.20 g/cm 3, [1] [16] which is approximately half that of glass, which is generally, depending on composition, 2.2–2.53 g/cm 3. [1] It also has good impact strength, higher than both glass and polystyrene, but significantly lower than polycarbonate and some engineered polymers.
In Google Glass, tapping Settings → Device info → View licenses, then tapping the touchpad 9 times, will show a Tap Meet Team option. Tapping again will show a photo of the Google Glass development team. [214] Any photograph with Christmas lights uploaded to Google+ would have been turned into an animated GIF, showing sparkling lights. [191]
Two principal techniques are used to produce seed beads: the wound method and the drawn method. The wound method is the more-traditional technique, is more time-consuming, and is no longer used in modern bead production: in this technique, a chunk of glass known in glassmaking as a gather and composed mainly of silica is heated on an iron bar until molten.