Israel awaits Trump's landmark visit with rising anxiety over goals US president arrives in Saudi Arabia for visit UN warns 200,000 people fleeing western Mosul in Iraq Hong Kong ripe for smart application development: Academician Xi congratulates Rouhani on re-election as Iranian president Rouhani urges US to drop 'hostile' policies towards Iran New method helps monitor aircrafts in extreme temperatures Trump, Erdogan vow to repair US-Turkish relationship amid existing differences Chinese doctors perform robot-assisted brain angiography Sharing the story of China Facial recognition to be used to safeguard drinking water source Re-elected Rouhani vows Iran's more interaction with world and 'no' to extremism Under fire at home, Trump launches first foreign trip in Saudi HKSAR gov't says vaccine procurement entirely based on scientific evidence China's cosmic ray observatory half functional New anti-cancer treatment developed by Hong Kong researchers significantly reduces tumour size Under fire at home, Trump launches first foreign trip in Saudi Iran's presidential election begins as supreme leader casts vote Iranians demanding change deliver emphatic victory for Rouhani