Revelation 11:3 - And I will grant authority to my two witnesses, and they will prophesy for 1,260 days, clothed in sackcloth.

Since these two witnesses seem to be a important part in the "first woe," I wonder why they aren't named. Are they someone whom we already know, or are their identities to be determined when the event occurs?

Revelation 8:1 - When the Lamb opened the seventh seal, there was silence in heaven for about half an hour.

Because there was no preceding silence for the first six seals, I question why there was silence for the seventh one. Did it have something to do with the extreme magnitude of the seal's content, or was it for dramatic effect? Perhaps another factor could be considered.