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2. Europa Clipper - Wikipedia

   en.wikipedia.org/wiki/Europa_Clipper

   The high-gain antenna operates on X-band frequencies of 7.2 and 8.4 gigahertz, and a Ka-band frequency of 32 gigahertz (12 times that of a typical cell phone).The antennas will be used to research gravity and radio science, allowing researchers to learn more about Europa's gravity [88] It was designed and constructed by a team led by Matt Bray ...

3. Battery tester - Wikipedia

   en.wikipedia.org/wiki/Battery_tester

   Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

4. Gravity battery - Wikipedia

   en.wikipedia.org/wiki/Gravity_battery

   Pendulum clock driven by three weights as "gravity battery". An old and simple application is the pendulum clock driven by a weight, which at 1 kg and 1 m travel can store nearly 10 Newton-meter [Nm], Joule [J] or Watt-second [Ws], thus 1/3600 of a Watt-hour [Wh], while a typical Lithium-ion battery 18650 cell [2] can hold about 7 Wh, thus 2500 times more at 1/20 of the weight.

5. Ratchet (device) - Wikipedia

   en.wikipedia.org/wiki/Ratchet_(device)

   A ratchet consists of a round gear or a linear rack with teeth, and a pivoting, spring-loaded finger called a pawl (or click, in clocks and watches [1] [2]) that engages the teeth. The teeth are uniform but are usually asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.

6. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   4.5 + 4.5: H: 91.3 L: 65.1 W: 52.4 This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart.

7. The 6 most common headache types — and when to see a doctor

   www.aol.com/6-most-common-headache-types...

   Migraines disproportionately affect women – up to 18% in the U.S. — and are the leading cause of disability among females aged 18 to 50 globally, research has shown.

8. History of the battery - Wikipedia

   en.wikipedia.org/wiki/History_of_the_battery

   The NCC improved Gassner's model by replacing the plaster of Paris with coiled cardboard, an innovation that left more space for the cathode and made the battery easier to assemble. It was the first convenient battery for the masses and made portable electrical devices practical, and led directly to the invention of the flashlight.

9. J.Lo and Ben Affleck Are Still "Connected" and "Have a Lot of ...

   www.aol.com/j-lo-ben-affleck-still-134300279.html

   Turns out J.Lo and Ben “have a mutual respect for one another” and that's “not something that goes away” quickly. As the insider put it, “Obviously things haven’t been the same, but ...