Three American service members have been killed and casualties are reported in the UAE, Israel and Kuwait as Israel and Iran continue to trade strikes.

Israel says it is targeting sites "in the heart of Tehran", as new Iranian attacks are reported in Tel Aviv, Dubai, Doha and Bahrain's capital Manama.

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Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...