Yahoo Labs?

Never seen this Yahoo Address before, wonder what they were doing?

Name: rlx-2-4-10.labs.corp.yahoo.com
IP address: 66.228.182.210
OrgName: Overture Services (formerly Goto.com)
NetRange: 66.228.160.0 - 66.228.191.255

Accessed just a single page in the middle of my web site somewhere, very very odd.

So I expanded my log search based on the NetRange:

66.228.182.203
66.228.165.141
66.228.165.140
66.228.182.202
66.228.182.210

Just a handful of pages, very odd indeed, but one of the direct hits attempted to load an AdSense PSA alternate ad so was it a human or a new bot that executes Javascript?

Handful of hits, didn't load any graphics whatsoever or things a normal browser would do, and hit one page twice.

Very curious