Many scientists now question whether or not the spider is harmful at all.

But some scientists question whether these machines are really "learning" at all.

On the other hand, some scientists question whether Earth could recover from a snowball state.

Many scientists and environmentalists question whether the approach would serve any ecosystem well enough to be built into Federal law.

Some scientists also question how researchers will know whether the drugs are effective in individual cases.

Of course individual scientists will question the whole thing - that is their job!

But scientists questioned whether this could account for 18 such objects in one small sector of space.

Some scientists question whether the benefits will outweigh the risks.

And some political scientists question whether those newly registered voters will vote.

And some scientists question whether government officials, even now, appreciate the full extent of the dangers.