The phrase "are again experimenting with" is correct and usable in written English.
It can be used when discussing a return to a previous activity or process of experimentation after having done it before.
Example: "After a brief hiatus, the researchers are again experimenting with new methods to improve the efficiency of solar panels."
Alternatives: "are once more testing" or "are revisiting their experiments with".
The first devices using the essentials principles of rocket science are said to have occurred in 400 B.C. Three hundred years later, they were again employed by a more advanced Greek mastermind, only to be again experimented with, changed, and improved upon for a few hundred years until the first true rocket was invented by the Chinese in 1242.
Today, although the bean bags are long gone and PARC was spun out as a subsidiary a decade ago, its researchers are once again experimenting with printing.
Because of this, he never again experimented with long poetry.
Therefore there is resurgence in the interest in the natural dyes and again textile researchers are being engrossed in experimenting with natural dyes for coloration being renewable and non-toxic [1, 2].
These observations are again in excellent agreement with the results of bright-field TEM experiments.
The experimental and simulated NRVS data of M13V/K22M are again in very good agreement with experiment as shown in Figure 6.
The effects of (1) droplet redeposition, and (2) changes in the convective heat transfer coefficients and their distributions on the resulting ring preform heat flow and solidification were studied; and simulations were again compared with experiments.
Automakers like Toyota, with its hybrid and coming plug-in hybrid Prius, and Ford, with its coming C-Max family, already are experimenting with this idea, which again calls the utility of the Model E exercise into question.
"Today the avant garde has come full circle – the artist who wants to experiment is again faced with what seems like a dead end, except that instead of creating in a vacuum he is now at the centre of a cheering mob," Ashbery wrote.
