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When a train approaches or an ambulance with its siren blaring nears us, we hear the sound with an increased frequency, gradually decreasing slightly. As it passes, the frequency changes abruptly to a lower one, then decreases further. This commonly encountered Doppler effect can be a valuable clue to the nature of a phenomenon seemingly completely unrelated to sound propagation: heat transport.
Su Piow Ko on how AET is poised to redefine the possibilities of visual communication
The National Academy of Sciences of Belarus together with the Russian state space industry corporation Roscosmos have developed proposals for promising space programs Resurs-SG and Kosmodozor-SG.
UPSC Mechanical Engineering Books: Check the list of best books for IAS Mains along with the preparation strategy
(Reuters) -The U.N. aid chief on Friday said he was "deeply alarmed" by Israeli ministers' statements about "plans to encourage the mass transfer" of Palestinian civilians from the Gaza Strip to third countries and he called anew for a ceasefire. "Unless we act, it will become an indelible mark on our humanity," Martin Griffiths, the U.N. undersecretary for humanitarian affairs, told the U.N. Security Council. Griffiths painted a dire picture of a worsening humanitarian catastrophe in the Gaza S