U.S. President Donald Trump’s threat to impose steep tariffs on steel and aluminum imports sparked concerns of a trade war Friday, with emerging markets trading lower and some world leaders threatening to take retaliatory measures. Japan’s Nikkei share average fell to a more than two-week low Friday. The Nikkei ended …

Electronics, the lifeblood of the modern world, could soon be part of our daily diet. In a study appearing in ACS Nano, scientists report that they have developed a way to write graphene patterns onto virtually any surface including food. They say the new technique could lay the groundwork for …

OTTAWA—Justin Trudeau doubled down Wednesday on his support for a senior government official who suggested factions in the Indian government sabotaged the prime minister’s trip to India last week — despite a flat denial from India’s external affairs ministry which labelled the theory “baseless and unacceptable.” Trudeau’s insistence that the …