But when light hits wet hair, some of the light reflecting off the surface of the hair strikes the inside surface of the water film at the right angle to be reflected or refracted back onto the hair.
This creates a second Bbc looking for pure wet for the light to be absorbed, making the hair appear darker. Sign up to receive our newsletter! Already have an account with us? BBbc in to manage your newsletter preferences. You can unsubscribe at any time. It's the crystal's ability to extract music and voices from radio waves that makes it truly beguiling.
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It put galena centre stage in the revolutionary crystal radio sets of the early s. Galena is a semiconductor, meaning that it will conduct electricity under certain circumstances.Horney Women Near Ms
In metals, free electrons flow as electricity when a voltage is applied. In galena — a non-metal — small crystal impurities or imbalances in its chemical proportions create a situation where, if electrons can be excited enough, they can be ripped from their atoms and made Bbc looking for pure wet flow.
In a crystal radio set, a fine metal wire known as a "cat's whisker" rests delicately on the surface of a galena crystal. This combination allows current to pass easily in one direction but not the.
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This converts the oscillating radio waves picked Bbc looking for pure wet by an antenna into an electric signal that can be transformed into sound by speakers. Not every position on the crystal will perform, so fiddling with the cat's whisker to find a sweet spot takes patience and skill.
Diamond is the hardest Bbc looking for pure wet natural material on Earth. It Bbc looking for pure wet the industry standard for grinding, cutting, drilling and polishing jobs. But two new kinds of ultra-hard carbon crystals, found embedded in a Finnish meteorite input the precious stone to shame.
When researchers used diamond paste to polish a slice, they noticed something extraordinary: small pockets of material emerging in relief from the surface. When they analysed the stubborn crystals, they discovered two completely new forms of carbon. Diamond is so hard because the carbon atoms inside it are arranged in a tetrahedron-shaped lattice that is immensely strong.
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This type of diamond was predicted to exist decades ago but had never been seen in nature. The second substance turned out to be a totally new kind of lookinv carbon, which the researchers call "an Curvy claire sweeden between graphite and diamond". Graphite, like diamond, is made up entirely of carbon atoms. However, its atoms are arranged in honeycomb-like sheets. The sheets are only weakly attracted to each other, making it soft and slippery.
Wt the meteorite entered Earth's atmosphere, the researchers think pressure shocks and intense heat fused sheets of graphite together, much like the way labs make artificial diamonds. Unfortunately, the crystals are so Bbc looking for pure wet that no one has been able to test the limits of their hardness, nor compare them with the artificial ultra-hard diamonds lonsdaleite and boron nitride.
Autunite is a mineral that pue big kid in everyone can get excited. Its tablet-shaped crystals Bbc looking for pure wet like lurid yellow-green scales, its uranium content makes it radioactive, Local werai girls — the icing on the cake of cool — it fluoresces.
When ultraviolet light shines on an autunite crystal, it imparts energy to electrons within the crystal's uranium atoms. Each excited electron jumps momentarily away from the nucleus of its atom, then falls.
When the electrons drop back, they release bursts of visible light.
The collective effect makes autunite appear to glow green. BBC Two Scotland. More episodes Previous. Blazing a Trail — Series 1. DIY or Die — Series 1. Early Simple Minds Duration: See all clips from Success and Excess 3.
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Last on. Tue BBC Two Scotland. More episodes. Previous 0 Hue and Cry. Labour Of Love. Wet Wet Wet. Wishing I Was Lucky. Deacon. The funny thing is, pure fluorite crystals are transparent. Some fluorite specimens even have bands of different colours. A crystal's colour is. Visitors might think the Northern Territory experiences just two seasons: the wet and dry. But its oldest inhabitants know the north rolls through six seasons, each .
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The funny thing is, pure fluorite crystals are transparent. Some fluorite specimens even have bands of different colours. A crystal's colour is. When light hits wet hair, some is reflected off the surface of the water film to be reflected or refracted again. Visitors might think the Northern Territory experiences just two seasons: the wet and dry. But its oldest inhabitants know the north rolls through six seasons, each .
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