electron-indicator tube
51Chemical biology — is a scientific discipline spanning the fields of chemistry and biology that involves the application of chemical techniques and tools, often compounds produced through synthetic chemistry, to the study and manipulation of biological systems.… …
52hydrogen — /huy dreuh jeuhn/, n. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; at. wt.: 1.00797; at. no.: 1; density: 0.0899 g/l at 0°C and 760 mm pressure. [1785 95;… …
53Vincent Schaefer — Infobox Scientist name = Vincent Schaefer box width = image width =150px caption = Vincent Schaefer birth date = birth date|1906|07|04 birth place = death date = death date and age|1993|07|25|1906|07|04 death place = residence = citizenship =… …
54Polychlorinated biphenyl — PCBs redirects here. For printed circuit boards, see printed circuit board. Labelling transformers containing PCBs …
55Alias episodes (season 2) — NOTOC This article contains episode summaries as well as directing and writing credits from Season 2 of the American drama/adventure television series Alias . Season 2 aired starting on September 29, 2002 and concluded on May 4, 2003.Main… …
56Metalworking terminology — This article is a list of terms commonly used in the practice of metalworking. Contents 1 Processes 1.1 Casting 1.2 Forge work 1.3 Heat treating …
57Magnetosphere particle motion — A sketch of Earth s magnetic field representing the source of Earth s magnetic field as a magnet The north pole of earth is near the top of the diagram, the south pole near the bottom. Notice that the south pole of that magnet is deep in Earth s… …
58History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …
59Alias (season 2) — Alias Season 2 Country of origin  United States No. of episodes 22 …
60Copper in health — Normal absorption and distribution of copper. Cu = copper, CP = ceruloplasmin, green = ATP7B carrying copper. Copper is an essential trace element that is vital to the health of all living things (humans, plants, animals, and microorganisms). In… …
