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[3] The most common form of trinitite is green fragments of 1–3 cm thick, smooth on one side and rough on the other; this is the trinitite that cooled after landing still-molten on the desert floor. [22] [20] Around 30% of trinitite is void space, although quantities vary greatly between samples.
Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. [2] Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates.
US Vietnam War experience showed the need for air superiority fighters and better air-to-air training for fighter pilots. [11] Based on his experience in the Korean War and as a fighter tactics instructor in the early 1960s, Colonel John Boyd with mathematician Thomas Christie developed the energy–maneuverability theory to model a fighter aircraft's performance in combat.
The Giga Press program is a series of aluminium die casting machines manufactured for Tesla, initially by Idra Group in Italy. Idra presses were the largest high-pressure die casting machines in production as of 2020, with a clamping force of 55,000 to 61,000 kilonewtons (5,600 to 6,200 tf).
[146] [149] In the U.S., about 30% of 15- to 17-year-olds have had sexual intercourse, but only about 80% of 15- to 19-year-olds report using condoms for their first sexual intercourse. [150] In one study, more than 75% of young women age 18–25 years felt they were at low risk of acquiring an STI. [151]
The primary atmospheric circulation bands consist of the trade winds in the equatorial region below 30° latitude and the westerlies in the mid-latitudes between 30° and 60°. [220] Ocean heat content and currents are also important factors in determining climate, particularly the thermohaline circulation that distributes thermal energy from ...