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A new feature in Walmart’s Spark app is slowing the chain’s delivery efforts, workers say.The Spark delivery workers told Business Insider that Walmart’s app has changed a feature that helps them map out their trip around the store to pick up items. Instead of providing a set route that made…

Ukraine didn’t shoot down a single Russian ballistic missile during a massive attack that began Sunday night and killed and wounded dozens of people.Ukrainian officials said that the ballistic missiles were able to penetrate their country’s air defenses and strike their targets because Kyiv lacks critical interceptors, specifically the much-sought-after…