Top 100 presentations

1. Continuous Verb Tenses
   35372
2. Support and transport in plants
   33859
3. Anyong Tubig Anyong Lupa sa Asya
   29327
4. Elements compounds and mixtures
   26038
5. Chromosome
   22035
6. Simple Verb Tenses
   20800
7. Atomic Structure
   20247
8. Balancing Chemical Equations. Balancing redox equations
   20157
9. Periodic Behavior
   19907
10. Newton’s laws of motion
    18883
11. Periodic Trends
    16755
12. Adverbs
    16646
13. Percent Composition, Empirical and Molecular Formulas
    15988
14. Animal Farm
    15803
15. Bonding, Molecular Shape & Structure
    14747
16. Circulation and Gas Exchange
    13476
17. MakingFood
    13407
18. DNA - An overview
    13093
19. Atomic Structure and Periodic Trends
    12901
20. Fungi
    12887
21. Volumetric
    12680
22. Feminism- Cure or Curse
    12557
23. Atomic Structure and Periodicity
    12518
24. Hormones and the Endocrine System
    12159
25. Animal Development
    12100
26. Derivation Applications of Bernoulli Principal
    11911
27. Osmoregulation and Excretion
    11500
28. Plasma Membrane-Gateway to the Cell
    10799
29. Plant Structure, Growth, and Development
    10762
30. Acid, bases and salts
    10285
31. Development
    10219
32. Mirrors and Lenses
    10176
33. Structure of the Atom
    9940
34. Balanced forces
    9915
35. Ancient Civilizations
    9831
36. Mass Spectrometry
    9768
37. Pronouns
    9737
38. Nouns
    9685
39. Resource Acquisition and Transport in Vascular Plants
    9511
40. Forests
    9392
41. Support and transport in plants
    9365
42. Atomic Structure
    9308
43. Cell Types and Cell Structure
    8990
44. Newton’s third law of motion
    8941
45. Animal Nutrition
    8712
46. Transplantation Immunology
    8640
47. Cellular respiration
    8508
48. Growing Plants
    8368
49. Sensory and Motor Mechanisms
    8350
50. Electrical Circuits
    8256
51. Plant Responses to Internal and External Signals
    8208
52. Lab Equipment
    8040
53. Prepositions
    7991
54. Neurons, Synapses, and Signaling
    7902
55. Viruses, Viroids, and Prions
    7896
56. Of Mice and Men
    7824
57. A Tour of the Cell
    7738
58. Basic Structure of a Cell
    7666
59. Real time PCR and it's functions in diagnosis
    7631
60. Covalent Bonding (Molecules)
    7592
61. Plant structure adaptations and responses
    7547
62. Ionic Bonding
    7455
63. Cellular Division
    7443
64. Mendelian Genetics
    7105
65. To Kill a Mockingbird
    7073
66. Satellite Orbits and Uses NIS
    7033
67. Blood Type Genetics
    7031
68. Sound
    6931
69. Molecules and Ions
    6925
70. Well logging The Bore Hole
    6906
71. The Immune System
    6856
72. Membrane Structure and Function
    6782
73. Animal Reproduction
    6727
74. The Chemistry of Acids and Bases
    6675
75. Angiosperm Reproduction and Biotechnology
    6671
76. Rocks
    6610
77. Mendel and the Gene Idea
    6606
78. Plant Diversity
    6604
79. Cell Communication
    6560
80. Balancing Chemical Equations
    6506
81. Rate Laws
    6366
82. Drama
    6328
83. Introduction to Oscillations and Simple Harmonic Motion
    6321
84. Hybridization of Orbitals
    6320
85. The Building Blocks of Matter Atoms
    6260
86. Empirical Formula
    6214
87. Electron Quantum Numbers
    6175
88. An Introduction to Metabolism
    6158
89. Translation. Protein from RNA
    6092
90. Neurons
    6038
91. The Structure and Function of Large Biological Molecules
    5982
92. Photosynthesis
    5919
93. The Mole
    5911
94. Cell Membrane + Tissues & Organs Definitions
    5881
95. Earthquakes
    5844
96. Karyotypes
    5838
97. ADP, ATP and Cellular Respiration
    5805
98. Endocrine System
    5754
99. Classical greek philosophy
    5704
100. Population Ecology
     5659

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)