The speed and scale of the coronavirus crisis has hit everyone - the public, scientists and government.
And with that rapid change has been a flurry of new announcements from the government.
At the moment, Downing Street insists we're still on track to meet two crucial targets - 100,000 tests a day by May, and 18,000 ventilators in the NHS.
But each of those targets has been changed over time and each of them has faced accusations of failure along the way.
For example, the government said there'd be 25,000 tests a day "within 4 weeks" - three weeks and six days ago. No single day has yet gone above 20,000.
And Health Secretary Matt Hancock hoped to get 1,500 ventilators in the last week, only to get 200.
Overall the government has not broken its promises - but there have definitely been hiccups, and there is still the risk of failure in future.
Work and Pensions Secretary Therese Coffey today accepted "we’ve definitely had some deficiencies" but claimed there is "excellent progress" on testing.
She added: "We recognise there are still some gaps but we’re working with the NHS and the private sector to make sure we can reach that capacity.
"We do have a sufficient number of ventilators right now for the number of people in critical care, but we do anticipate we’ll need more."
So what exactly has the UK government promised on ventilators and testing, and how have those pledges evolved halfway down the road? Here's a timeline.
Testing
Note: Antigen or swab tests show if you currently have coronavirus. Antibody tests show if you have had it in the past and might have some immunity - but none have been approved for use yet.
March 18: A government statement pledged 25,000 swab tests per day, "expected to be ready within 4 weeks" after criticism the UK wasn't testing enough people for Covid-19.
March 25: Boris Johnson added to the pledge, saying the UK would be going "hopefully very soon up to 250,000 per day." But he didn't say when or how. His figure included both swab and antibody tests.
March 25: National Infection Service director Sharon Peacock said millions of antibody tests had been ordered - and she expected them to go through the approval process by the end of the week. This did not happen.
April 2: Health Secretary Matt Hancock pledged 100,000 tests a day by the end of April. That includes both types of test, with 25,000 in NHS or Public Health England, and the others in private labs.
April 3: Despite Sharon Peacock's comments on March 25, Mr Hancock admitted the government had not yet found a single antibody test that works. He said if needs be, the 100,000 target would be filled entirely by antigen tests - but could not guarantee it.
April 10: Mr Hancock announced there is finally enough capacity to test all NHS staff who need it - but not yet enough capacity for all social care workers who need it.
April 12: The most recent figures show 14,506 tests were carried out on Easter Sunday. With days left to hit the 25,000 target, and weeks to hit 100,000, no single day has yet seen more than 20,000 tests.
April 14: No10 announced that as of Easter Sunday, 47,784 carers (NHS staff) or their relatives have been tested for Covid-19. But only 505 social care workers have been tested, because there is still not enough spare capacity for all those with symptoms.
Ventilators
March 21: With 5,000 ventilators in the system at the start of the outbreak, manufacturing firm Smiths Group said the government had a target to get to 30,000 ventilators - including 5,000 extra in the following two weeks.
March 26: Government said the number of ventilators in the system had risen from 5,000 to 8,000. Another 8,000 'off-the-shelf' models were on order from overseas (16,000 total), plus thousands more (as yet unapproved) models built in the UK by firms like Dyson.
March 31: Cabinet minister Michael Gove said "the first of thousands" of these UK-built ventilators would arrive and be ready for use by the weekend.
April 1: Government officials clarified to the Mirror that 30 of the new ventilators Mr Gove referred to would arrive by the weekend, with the thousands of others only expected later on.
April 5: Health Secretary Matt Hancock cut the overall ventilator target, saying that thanks to the lockdown the NHS would now only need 18,000 ventilators not 30,000. He said 9-10,000 were now in the system, around double the 5,000 at the start of the outbreak in the UK.
April 5: Health Secretary Matt Hancock told the BBC there "should be another 1,500" ventilators in the next week.
April 13: A week after Mr Hancock's claim, No10 said 200 more ventilators had been introduced into the NHS in the past week.
April 14: No10 said 10,000 ventilators are now in place, with 2,000 more on order. But this is 4,000 fewer than the government previously said were either in place, or on order - the Mirror was originally said there were 8,000 of each, plus extras from the UK's ventilator challenge.
