WEBVTT X-TIMESTAMP-MAP=LOCAL:00:00:14.000,MPEGTS:2160000 00:00:14.000 --> 00:00:17.000 line:90%,end position:50%,center size:80% align:center Today we look at how the tides work. 00:00:17.500 --> 00:00:19.500 line:10%,start position:50%,center size:80% align:center [waves crashing]