What is the shortcut to duplicate a layer?

HDR, now an option in Photoshop, stands for...

Already having a section selected, what does holding 'option' (or 'alt') do while using any of the lasso tools?

Tool to create a vector layer?

One way to change ruler increments:

Difference between the Spot Healing brush and the Healing brush?

Which selection option can be selected from the top option bar when using the selection tool?

Tool to make selections based on color and tone?

Regarding Camera Raw's toolbar which tool will cool the colors if pixels are too warm?

What does the Unsharp mask filter do?

Which selection tool has a Fuzziness option?