When you receive a notification on Glass, you'll see a card similar to this:

Tap the touchpad to see the following options:

Option in Glass	What it does
Read more	Displays the text of the card for you to read.
Read aloud	Glass will read the card to you.
Share	Shares the card with Google Plus circles that you choose.
Get directions	Provides walking, biking or driving directions.
Explore	Turns on Explorer mode to receive more frequent notifications. Shown only if you have Explorer disabled.
End exploring	Shown only if you have Explorer mode enabled. Tapping on this option disables Explorer mode (frequent notifications).
Favorite	Flags as one of your favorite cards to reference later.
Snooze	Pauses notifications for the rest of the day.