* Clicking the picture in a posting generally opens a Google Photos album, displaying large "thumbnails" of the photos in the album.
* Click one of the thumbnails to open the photo viewer.
* Use the left & right cursor arrow keys to move from picture to picture. (Or click the left or right edge of the picture.)
* Many of the photos are larger than your screen. Use the mouse wheel to zoom in & out. Drag the image with the mouse to pan around.
(Note, though, that you must zoom all the way out before you can move to the next picture.)
* Click the i-in-a-circle icon (upper right) to display the full caption for the picture, which is sometimes a substantial sidebar narrative.
* Press F11 to make the picture completely fill the screen. Press F11 again to get out of full-screen mode.
* Hit the Esc key to return to the thumbnails. When you're done with the album, close the browser tab (click the X to the right of the album title at the top of the screen).
