(IMAGE) Karlsruher Institut für Technologie (KIT) Caption All-optical data memory: ultra-short light pulses make the GST material change from crystalline to amorphous and back. Weak light pulses read out the data. Credit Photo: C. Rios/Oxford University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.