When sampling the aperture of a telescope, using auto-collimating flats (ACFs) is more economical
In 1969, Chinese forces instigated a brutal ambush on unsuspecting Soviet border guards at Zhenbao Island, a contested bank on the Ussuri River. After numerous rough but not lethal hand-to-hand scuffles in the past, the island became the epicenter of a pitched battle and weeks-long exchange of fire. The initial ambush, conducted with small arms, escalated into deployment of heavy armor supported by rocket artillery. Hundreds of people were killed. Within two weeks, both sides were contemplating the possibility of a nuclear exchange.
Loneliness got a mind of its own The more people around, the more you feel alone
The three-day festivities closed with bou-bhat, when the bride served rice to the male elders of her husband's family.
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