The ride-sharing juggernaut has revised down the value it proposes for its initial public offering by about 30%, to between US$80.5 to US$91.5 billion. This follows sharp falls in recently listed rival Lyft since its IPO. There are concerns over intensifying competition, high operating costs and the fact that since launching services in July 2010, Uber is yet to make a profit.

Israeli scientists have succeeded in printing a mini heart the size of a cherry tomato, complete with cells, blood vessels, ventricles and chambers. Engineered with bio-ink made from the tissue of patients.

Research at the University of Wisconsin-Madison suggests that botox and cosmetic surgery can prevent facial expression mimicry between people and even prevent emotions and empathetic thoughts. The loss of minute facial movements could result in disconnection from your feelings and those of others.

Age-verification for online pornography will come into force on 15 July 2019 in the UK. It's an effort to protect minors from stumbling across explicit material and is a worthy goal, but there are questions about privacy, data security and whether it's technically viable.

A Russian start up has grand plans to place artificial constellations of cubesats in orbit to promote Pepsi's Adrenaline Rush energy drink. The coordinated swarm would light up as a giant billboard visible from Earth. Aiming to launch in 2021, $20,000 could buy 8 hours of night sky advertising.

In a PR disaster reminiscent of the Galaxy Note 7 snafu, the South Korean tech behemoth has indefinitely postponed the public release of its latest bendable smart phone-come-tablet after reviewers around the world reported breakages and basic quality issues with the very expensive gadget.

Is blockchain, the technology that underpins Bitcoin and other crypto currrencies, just a passing fad or can it have long-term benefits for Australian industry and employment? A comprehensive report has just been released by the Australian Computer Society called 'Blockchain 2030: A Look At The Future Of Blockchain In Australia' which strives to shed light on this question. One thing is certain though - billions of dollars of investment is now being made by those who believe in a blockchain blockbuster future.

Despite assurances it's secure and your privacy is protected, sources claim that in addition to software and AI responding to your Alexa voice commands, there are humans listening back at Amazon.

The Event Horizon Telescope, a huge effort of more than 200 scientists who synchronised 8 different telescopes around the world, has directly imaged a black hole for the first time. Located at the heart of galaxy Messier 87, it is 55 million light-years from Earth and has a mass some 6.5 billion times that of our Sun.

The Human Research Program is NASA's comprehensive effort to enable safe and productive travel for people in space. Now retired identical twin astronauts Scott and Mark Kelly took part in a year long mission to closely compare changes in their bodies. Scott spent more than 300 days aboard the ISS, while Mark remained on Earth. Both submitted to regular checks of their immune systems, genetics, bone formation, gut bacteria, the effects of vaccines, radiation and biochemical changes. The information recorded will be used for years to come to understand how to make a return journey to Mars survivable.