had apparently fallen from an upper floor. it quoted the russian embassy as saying the incident was a tragic accident. a memorial service has been held at washington's national cathedral for the late colin powell, who died last month. president biden was among those attending. powell was the first black us secretary of state, a retired army general and a former national security adviser. he died at the age of 84 due to complications from covid—i9. ii us states are suing the biden administration over its plans to get workers vaccinated or regularly tested for coronavirus. the missouri attorney generals office says it's seeking a judicial review and that the federal agency in charge of the plan doesn't have the authority to issue it. the biden administration has said all companies with 100 staff or more will have to comply with the rule from january or risk big fines. let's look more closely at one aspect of climate change. researchers say the carbon