This week marks the 20th anniversary of the ThinkPad laptop, launched by IBM back in 1992, and which survives as a successful business-focused brand to this day.
The ThinkPad has changed over the years as PC technology has evolved, but has managed to retain a distinctive styling of its own, such as the black colour scheme of the original 700c model.
It has even survived the sale of IBM's PC division to Lenovo in 2005, and has arguably gone from strength to strength since then.
The ThinkPad has seen a number of firsts over the 20 year period, including its claim to be the first laptop with an integrated CD-ROM drive and the first to feature built in wireless technology.
One notable innovation from the earlier days was the famous Butterfly keyboard on the ThinkPad 701 series (below) released in 1995, which unfolded as the laptop lid was opened to present a wider keyboard than would otherwise fit into the chassis.
Another ThinkPad characteristic that goes all the way back to the first model is the TrackPoint mouse controller embedded in the middle of the keyboard, which serves as an alternative to the touchpad almost universally used in other laptops.
But not all ThinkPad innovations were successful. The ThinkPad TransNote of 2001 (below) combined a laptop with a digitiser pad that allowed the user to capture handwritten notes, but failed to catch on.
We sacrificed our weekend to try out the new Vikendi map coming to PUBG - and rather liked it
12 of the 32 stars observed feature rings and gaps that are usually carved by planets in the process of formation
The experiment is currently underway at South Korea's Yangyang Underground Laboratory
Exoplanet HAT-P-11b is located about 124 light years from Earth