so if you decide you want to get into a water gun fight don't do it with a former nasa engineer mark robermark is now the proud owner and creator of the world's largest super soaker. it can firewater at more than 270 miles per hour. hard enough to break glass and to slice a watermelon. >> instead of using pressurized air to fire like the toy version rober uses pressurized tasks of nitrogen gas. >> totally normal. >> last year he put together thd morning washington. it's july 12th, and this hump day will have you turning up the air conditioning. meteorologist veronica johnson has more on a heat wave that will last for days. first-- here are some other top stories. donald trump junior is defending himself, after revealing that he met with a russian presidential campaign. it happened last june. trump junior took to twitter earlier tuesday releasing the email chain that led up to the meeting with the lawyer, who he was told had compromising information about - hillary clinton. trump junior said the meeting was a waste of time, and he never revealed it with his father. however, the revelation i

so if you decide you want to get into a water gun fight don't do it with a former nasa engineer mark roberk is now the proud owner and creator of the world's largest super soaker. it can firewater at more than 270 miles per hour. hard enough to break glass and to slice a watermelon. >> instead of using pressurized air to fire like the toy version rober uses pressurized tasks of nitrogen gas. >> totally normal. >> last year he put together the world's largest nerf gun. ♪ to keep hair strong against styling damage, you need... ...more than a conditioner, ...you need a miracle. pantene 3 minute miracle daily conditioner... has a super concentrated pro-v formula... ...that makes hair stronger* in just 3 minutes. so your hair is smoother everyday. pantene 3 minute miracle daily conditioner. because strong is beautiful. copdso to breathe better,athe. i go with anoro. ♪go your own way copd tries to say, "go this way." i say, "i'll go my own way" with anoro. ♪go your own way once-daily anoro contains two medicines called bronchodilators, that work together to significantly improve lung function al

. >> mark rober. how bad is this? you see that? it can break glass. force to slice through a watermelon and shatter glass as well. >> and he built this thing for his kids? >> he built it for fun. >> what could possibly, possibly go wrong. >> that would be great. >> at the summit. >> that would be great g-8 summit. >>> on to the most epic battle we've ever seen at wimbledon. a man and his >>> this morning on "world news now." the president's son under fire and defending his controversial meeting with a russian lawyer. how donald trump jr. is denying allegation of collusion after releasing the e-mail exchange. >> speaking of that lawyer with reported ties to the kremlin. she's now speaking out about the meeting with the president's inner circle. who is she, and what did three she bring to the discussion? brian ross digging deeper. >>> and new this half hour, a harrowing video captures a couple's terrifying drive to escape the wildfires in canada. >> the couple finding themselves smack in the middle of that intense blaze. >>> and american league wins the

well, former nasa engineer mark rober has constructed the world's biggest and most powerful supersoaker. it can fire water at 270 miles an hour and instead of using pressurized air like the toy version, this one uses pressurized tanks of nitrogen gas. it fires hard enough to slice a watermelon and shatter glass. so you might need to cool off today. doug: let's take a quick look at the forecast. it will be hot and humid and it could feel close to 100 this afternoon. adrianna: thanks for joining us this midday. watch abc 7 news at 4:00 and we'll see yoto from fields and factories they came looking for opportunity. they worked hard. we helped them work harder. they are the students of strayer university. for 125 years, we've supported as they've rewritten the future. we say, let's get it, america. >> welcome, everybody, to celebrity week, las vegas. today, we've got one of the biggest stars from the strip. ventriloquist, paul zerdin playing for his favorite charity. this guy's amazing so don't you move. >> hey, this sounds fun. from bally's las vegas, let's play "who wants to be a milliona

. >> mark rober. how bad is this? you see that? it can break glass.is thing for his kids? >> he built it for fun. >> what could possibly, possibly go wrong. >> that would be great. >> at the summit. >> that would be great at the g8 summit. >>> on to the most epic battle we've ever seen at wimbledon. a man and his poncho. >> oh, who won? >> oh, who won? at 15, i was addicted. by 40, i'll have lung disease. at 50, i'll die of a heart attack. dr. regina benjamin: cigarette smoke causes immediate damage that leads to health problems, even death. those who quit or die are being replaced by a new generation of smokers. i'm dr. regina benjamin, united states surgeon general. go to cdc.gov. learn how to make our next generation tobacco-free. >>> this morning on "world news now." the president's son under fire and defending his controversial meeting with a russian lawyer. how donald trump jr. is denying allegation of collusion after releasing the e-mail exchange. >> speaking of that lawyer with reported ties to the kremlin. she's now speaking out about the mee