Problem: Many assembled PCBs are static sensitive, and therefore must be placed in antistatic bags during transport. When handling these boards, the user must be grounded (earthed). Improper handling techniques might transmit an accumulated static charge through the board, damaging or destroying components. Even bare boards are sometimes static sensitive. Traces have become so fine that it's quite possible to blow an etch off the board (or change its characteristics) with a static charge. This is especially true on non-traditional PCBs such as MCMs and microwave PCBs.
What force can easily change or even completely destroy an etch on a PCB?
The answer is the following: static charge

Problem: During and after the Greek War of Independence, Greeks of the diaspora were important in establishing the fledgling state, raising funds and awareness abroad. Greek merchant families already had contacts in other countries and during the disturbances many set up home around the Mediterranean (notably Marseilles in France, Livorno in Italy, Alexandria in Egypt), Russia (Odessa and Saint Petersburg), and Britain (London and Liverpool) from where they traded, typically in textiles and grain. Businesses frequently comprised the extended family, and with them they brought schools teaching Greek and the Greek Orthodox Church.
What did they do that contributed to the Greek's success of establishment?
The answer is the following: important in establishing the fledgling state, raising funds and awareness abroad

Problem: Measurement of light or photometry is generally concerned with the amount of useful light falling on a surface and the amount of light emerging from a lamp or other source, along with the colors that can be rendered by this light. The human eye responds differently to light from different parts of the visible spectrum, therefore photometric measurements must take the luminosity function into account when measuring the amount of useful light. The basic SI unit of measurement is the candela (cd), which describes the luminous intensity, all other photometric units are derived from the candela. Luminance for instance is a measure of the density of luminous intensity in a given direction. It describes the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle. The SI unit for luminance is candela per square metre (cd/m2). The CGS unit of luminance is the stilb, which is equal to one candela per square centimetre or 10 kcd/m2. The amount of useful light emitted from a source or the luminous flux is measured in lumen (lm).
What is the amount of useful light emitted from a luminous flux measured in? 
The answer is the following: lumen (lm)

Problem: The early track record of the CIA was poor, with the agency unable to provide sufficient intelligence about the Soviet takeovers of Romania and Czechoslovakia, the Soviet blockade of Berlin, and the Soviet atomic bomb project. In particular, the agency failed to predict the Chinese entry into the Korean War with 300,000 troops. The famous double agent Kim Philby was the British liaison to American Central Intelligence. Through him the CIA coordinated hundreds of airdrops inside the iron curtain, all compromised by Philby. Arlington Hall, the nerve center of CIA cryptanalysisl was compromised by Bill Weisband, a Russian translator and Soviet spy. The CIA would reuse the tactic of dropping plant agents behind enemy lines by parachute again on China, and North Korea. This too would be fruitless.
How many troops did the Chinese enter into the Korean War?
The answer is the following:
300,000