What does the "500" HTTP server error code mean?

Being an as­tro­naut. Shut­tle­worth founded Thawte in 1995, which spe­cial­ized in digital cer­tifi­cates and Internet se­cu­ri­ty. His South African company flour­ished thanks to American ban on export of cryp­tog­ra­phy, which limited foreign op­er­a­tions of US cryp­to­graph­ic com­pa­nies. Mark sold Thawte to VeriSign in December 1999, earning US$ 575 million (he aged 26 then). Later he became the second space tourist in the world, and founded Canon­i­cal.

Single crystal silicon is used in the fab­ri­ca­tion of semi­con­duc­tors. On the quantum scale that mi­cro­pro­ces­sors operate on, the presence of grain bound­aries would have a sig­nif­i­cant impact on the func­tion­al­i­ty of field effect tran­sis­tors by altering local elec­tri­cal prop­er­ties. There­fore, mi­cro­pro­ces­sor fab­ri­ca­tors have invested heavily in fa­cil­i­ties to produce large single crystals of silicon.

Thermal printer. Reg­is­ters typ­i­cal­ly use thermal printers to print re­ceipt­s, although older dot matrix printers are still in use at some re­tail­er­s. Ther­mo-sen­si­tive coating used in thermal paper is sen­si­tive to in­ci­den­tal heat, abra­sion, friction (which can cause heat, thus dark­en­ing the paper), light (which can fade printed images), and water.

USB Hub. A USB hub is a device that expands a single Uni­ver­sal Serial Bus (USB) port into several so that there are more ports avail­able to connect devices to a host system, similar to a power strip.