. >> one expert believes that this mix of online and at school classeses could become the n ne normalala secondd or third wave of infections couould strikeke. so it's important to securere, a backup, otherer ways of teachg than h having kids come t to sc. i think we're moving toward an era in whwhich two t tes off learning will exist inn paralle. online learning and physically attending school. >> the school is now considering shortening the -- hallways to make up for the time lost to the pandemic. here and elsewhere in japan, one crucial key is to devise ways of dealing with uncertainty. nhk world, amori. >>> mayan momentum, an international team of researchers has discovered what may be the oldest and largest structure from the maya, challenging the way modern archaeologists understand the ancient civilization. the team, led by university of arizona archaeologists discovered the monument by airborne laser scannining while flying overr the mexican state.. the giant structure measures over 1,400 meters in length, 15 meters in height. based on analysis of excavated pieces of wooood resea