News Summary — 2026-07-21

AI-generated daily news intelligence across 5 categories.

• World — Zelensky sacks Ukraine's top army commander after days of protests.
• Business — Donald Trump to impose 50% tariff on most Canadian goods, White House says.
• Technology — Samsung Galaxy Unpacked July 2026: How to watch.
• Sports — The AL shuts out the NL to win the All-Star Game! ....
• Science — Scientists found mystery bacteria inside one of the ocean’s most elusive whales.