You can collect Youtube and Vimeo videos. Hover the video on the left and drag&drop little blue icon to collect the video.
Have problems? Try refreshing the website
How to collect text?
Mark the text you want collect. And then drag&drop it to sidebar.
If you're using Mac, mark the text and before dragging, hold down the mouse clicked for a second.
Have problems? Try clicking extension icon
Mark this text and start dragging Space is the boundless three-dimensional extent in which objects exist and events occur and have relative position and direction. Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime.
How to collect links?
At the top of your browser next to web address (http://...) there is a little icon. Drag&drop that icon to sidebar to collect the link.