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Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note B KEY    US $169.00

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note FG rare KEY    US $159.00

Crystal Chakra Quartz SINGING BOWL factory last chance size 8 tuned Note D KEY    US $149.00

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note D KEY    US $125.00

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note E KEY    US $189.00

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note G KEY    US $149.99

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note BB KEY    US $159.99

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note rare A KEY    US $169.00

Crystal Chakra Quartz SINGING BOWL factory last size 8 tuned Note tough A KEY    US $159.00

Crystal Chakra Quartz SINGING BOWL factory box size 8 tuned Note C KEY    US $159.99

Crystal Chakra Quartz SINGING BOWL factory last chance size 8 tuned Note B KEY    US $149.00

Calcite Necklace 05 Key Gray Howlite Heart Silver Crystal Healing Gem 17    US $40.00

Natural Agate Quartz Geode Crystal Key Ring    US $29.99

Natural Purple Amethyst Crystal Key Ring    US $29.99

Natural Clear Quartz Rock Crystal Key Ring    US $29.99

Beautiful Natural Yellow Quartz Crystal Key Ring    US $29.99

Lava Keychain 01 Black Rectangle Crater Silver Key Ring Crystal Healing Stone    US $30.00

Quartz Key Chain 01 Set of 2 Rainbow Stones Clear Crystal Tumbled Rocks Cool    US $19.00

Smoky Quartz Key Chain 01 Set of 2 Clear Tumbled Crystal Stones Healing Energy G    US $19.00

Quartz Crystal pendant charm drop key bridge formation 28x12x12 mm 656 gm 2B    US $19.99

Agate Keychain 01 Crystal Black Circle Key Ring Stone Silver Vitality    US $20.00

Jasper Keychain 01 Forest Green White Crystal Healing Stone Key Ring    US $20.00

Jasper Keychain 02 Mookaite Pink Red Yellow Key Ring Crystal Stone    US $20.00

Lapis Keychain 01 Blue Stone Lion Stuffed Animal Silver Key Ring Crystal    US $20.00

Lepidolite Keychain 01 White Wavy Oval Silver Key Ring Crystal Healing    US $20.00

Lepidolite Keychain 02 Pink Wavy Oval Key Ring Crystal Healing Stone    US $20.00

Marble Keychain 01 Redwood Brown Oval Silver Key Chain Crystal Stone    US $20.00

Marble Keychain 02 Tan Oval Silver Key Crystal Energy Healing Stone    US $20.00

Marble Keychain 03 Rainforest Green Oval Silver Key Chain Crystal Energy    US $20.00

Quartz Key Chain 02 Clear Rainbow Heart Love Energy Stone Cute Crystal Gift    US $14.25

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A novel way to concentrate sun’s heat (MIT)

Most technologies for harnessing the sun’s energy capture the light itself,
which is turned into electricity using photovoltaic materials. Others use the
sun’s thermal energy, usually concentrating the sunlight with mirrors to
generate enough heat to boil water and turn a generating turbine. A third,
less common approach is to use the sun’s heat — also concentrated by mirrors —
to generate electricity directly, using solid-state devices called
thermophotovoltaics, which have their roots at MIT dating back to the 1950s.

Now, researchers at MIT have found a way to use thermophotovoltaic devices
without mirrors to concentrate the sunlight, potentially making the system
much simpler and less expensive. The key is to prevent the heat from escaping
the thermoelectric material, something the MIT team achieved by using a
photonic crystal: essentially, an array of precisely spaced microscopic holes
in a top layer of the material.

The approach mimics Earth’s greenhouse effect: Infrared radiation from the sun
can enter the chip through the holes on the surface, but the reflected rays
are blocked when they try to escape. This blockage is achieved by a precisely
designed geometry that only allows rays that fall within a very tiny range ...

MIT