Editorial by Jörg Tremmel, Maria Lenk, Antony Mason, Markus Rutsche

“…This answer to his one-question test was used by Barack Obama in several of his speeches to demonstrate how humanity has made progress up until the present day. …”
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Experimental study on the impact of perpendicular and parallel bedding planes on the physical and geomechanical characteristics of carbonate rocks by Ahmed K. Abd El-Aal, Ahmed E. Radwan, Jabir Hussain, Mahrous A. M. Ali

“…Petrography revealed a total of 4 lithofacies of dolosparite, dolomicrite, foraminiferal wackestone (FW), and foraminiferal grainstone/packstone (GMF) in the Khoman Formation, and three microfacies of vuggy dolostone, sandy dolostone, and marly dolostone in both of El-Heiz and Ain Giffara formations. …”
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Effect of Impact Load on Concrete Containing Recycled Tire Rubber Aggregate With and Without Fire Exposure by Muhammad Arf Muhammad, Wrya Abdulfaraj Abdullah faraj, Mohamed Raouf Abdul-Kadir

“…Each specimen was then tested in a drop-weight impact machine by dropping 2240-gr and 4500-gr hammers from heights of 280 mm and 450 mm. The average impact energy of three identical specimens required for the occurrence of the final fracture was calculated. …”
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Investigation and evaluation of the efficiency of palm kernel oil extract for corrosion inhibition of brass artifacts by Mohamed M. Megahed, Eman AbdElRhiem, Wesam Atta, Nabil Abdel Ghany, Mohamed Abdelbar

“…Electrochemical tests showed that corrosion inhibition efficiency increased with higher palm kernel oil concentrations, with the 7% concentration exhibiting the highest corrosion protection, up to 99.7%.…”
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Assessing the Suitability of Recycled Concrete Material in the Production of Concrete. by Mumbere, Collins

“…Hardened concrete cubes of unknown compressive strength were randomly hammered to obtain the recycled aggregates that were used for experimentation. …”
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