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We have good quality liquid hydrogen going through the engines. and there's no fuzz on that. >> reporter: for a mission as complicated as this, nasa's fix for a bad sensor is surprisingly simple -- >> is part of the plan, is part of the risk posture for this second launch attempt to simply ignore it? >> yes, we will. >> okay. >> reporter: turns out if nasa had been able to push through the tect kal hnical weatproblem monday, the weather would have cooperated. >> we're also sitting here and as soon as we heard scrub, we're like, oh. so, it is what it is. >> reporter: cnn was granted rare access...

Away from the viewing stands. it is another to see it right here almost directly at the launch pad. this rocket is absolutely massive, 322 feet tall. it's taller than the statue of liberty. and you really get a sense when you're out here that this truly is the most powerful rocket ever built. but more power means it's also more complex. nasa says it has repaired the hydrogen leak that delayed launch on monday. the engine number 3, the cooldown system was working and blames it on a bad sensor. >> we have convinced ourselves without a shadow of a doubt that we have good quality liquid hydrogen g...

UK variant discovered at University of Pittsburgh and Penn State campuses The University of Pittsburgh ordered students to shelter in place after a large outbreak of COVID-19 cases last week. The number of active infections rose to 76 among staff and students, with 72 infections recorded in the last week alone. The total number of infections at the university now stands at over 1,060 for students and 207 for faculty and staff. In a statement last week by the COVID-19 Medical Response Office (CMRO), the university noted that the rise in cases is likely tied to the rise in the surrounding commu...

Respect. >> what's the threat level right now as we go into 9/11 and with the vulnerabilities that we are seeing throughout this nation? >> no terrorist should view us as vulnerable right now. farthest thing from the truth. second, there is no actionable, credible threat to the united states right now. we've run those regular risk posture meetings here at the white house and we bring together the entirety of the intelligence community when we do so. there is no current credible actionable threat, terrorist threat against the homeland but we will continue to track that and if we learn of such a...