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The weight of each term is given by the proportion of each sub-triangle area with respect to the total triangle area . Algebraically, this can be expressed like so:

With spring on the way, it's time to throw the windows open and get a fresh start. For the past two years, Amazon has launched its Big Spring Sale, a now annual event that brings major markdowns to warm-weather items ahead of the new season. While Amazon hasn't provided an official announcement for its 2026 spring sale, we suspect that it's coming soon.

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Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10194-3

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Concerns about the wider implications of such a change pulsed through discussions at the World Economic Forum in Davos last month and have contributed to widespread economic anxiety in the US.