Metal Seals are primarily used in static applications for temperatures as high as 1000°C/1832°F and pressures as high as 6825 bar/99000 psi for select applications. At low cryogenic temperatures and low pressures, such as vacuum seal applications, metal inserted seals are far better than polymers since they do not become brittle and lose elasticity. Metal seals also have a low leakage rate down to 1 x 10-12 cc/sec per mm circumference which in comparison to high load O-rings is almost 100x better.

http://www.yoseals.com/plastic....-seal/adjustable-len

Zirconium is abundant in S-type stars in which heavier elements are formed by neutron capture. Traces of the element are also present in the Sun, and rock brought back from the moon was found to have a surprisingly high zirconium content.

http://www.unicorntungsten.com/zirconium/

Vertical File Cabinets

Vertical file cabinets are a great way to store files without taking up too much floor space. These compact file storage options come in a wide variety of styles and materials as well, including wood veneer, laminate, metal and solid wood.

http://www.leechenfurniture.co....m/vertical-file-cabi

Ultrasonic sensors measure the height of the fuel in the tank by sending out ultrasonic signals, which are measured on the other side of the tank via another sensor. On the other hand, when capacitance sensors with driver fatigue monitor are used, the fuel passes through special vents when it consumed, causing the capacitance to change in the sensors, enabling the level of the fuel in the tank to be determined. This information is then passed on to the pilots via the onboard computing system.

http://www.fleet-sensor.com/dr....iver-fatigue-monitor

Passive Solar Water Heating Systems

Passive solar water heating systems are typically less expensive than active systems, but they're usually not as efficient. However, passive systems can be more reliable and may last longer. There are two basic types of passive systems:

http://www.ensuntec.com/solar-....collector/flat-panel