Barriers

Ironically, though, the more capable the individual devices become, the more frustrating are the challenges that come with not having them work together more effectively. In the past, all the serious work only happened on PCs, so that was the only logical choice for many tasks. Similarly, large capacity storage was also only available on PCs, meaning they were the only place you needed to go to look for whatever files you desired.

Bob O’Donnell | Techpinions.com

Cells

Cells have been characterized and classified with increasing precision since Robert Hooke first identified them under the microscope in the seventeenth century. But biologists have not yet determined all the molecular constituents of cells, nor have they established how all these constituents are associated with each other in tissues, systems and organs. As a result, there are many cell types we don’t know about. We also don’t know how all the cells in the body change from one state to another, which other cells they interact with or how they are altered during development.

Orit Rozenblatt-Rosen, Michael J. T. Stubbington, Aviv Regev & Sarah A. Teichmann | Nature