21.   Sandia engineers believe the net improvement will allow some amputees who use wheelchairs to walk.

22.   Russian engineers believe the Mir fire was caused by a small breach in the canister that cosmonaut Alexander Lazutkin was installing in a containment device.

23.   Russian engineers believe the rupture is beneath the mast of a mangled solar panel on Spektr.

24.   Shuttle engineers believe the crack formed in a weld seam in the aluminum vent pipe due to contraction in the frigid vapors of the hydrogen.

25.   Shuttle engineers believe the grime has been accumulating for years, Harbaugh said.

26.   Some engineers believe that it could be used to fuel civilian nuclear reactors.

27.   The narrow line used to periodically jettison the fluid into space has been blocked since midweek by what engineers believe is a clogged filter.

28.   Those, too, should pay for themselves through increased efficiency, engineers believe.

29.   Two Italian engineers believe they have found a new system for testing the stability of skis without taking them out on the piste.

30.   Army engineers believe the tunnels were dug using a small tunneling machine and took anywhere from a week to a month to complete.